True Bipolar Input, Dual 12-Bit/14-Bit,
2-Channel, Simultaneous Sampling SAR ADC
AD7366/AD7367
FEATURES
Dual 12-bit/14-bit, 2-channel ADC
True bipolar analog inputs
Programmable input ranges:
±10 V, ±5 V, 0 V to 10 V
±12 V with 3 V external reference
Throughput rate: 1 MSPS
Simultaneous conversion with read in less than 1 μs
High analog input impedance
Low current consumption:
8.3 mA typical in normal mode
320 nA typical in shutdown mode
AD7366
72 dB SNR at 50 kHz input frequency
12-bit no missing codes
AD7367
76 dB SNR at 50 kHz input frequency
14-bit no missing codes
Accurate on-chip reference: 2.5 V ± 0.2%
−40°C to +85°C operation
High speed serial interface
Compatible with SPI®, QSPI™, MICROWIRE™, and DSP
iCMOS®
process technology
Available in a 24-lead TSSOP
FUNCTIONAL BLOCK DIAGRAM
V
DD
D
CAP
A
AV
CC
DV
CC
REF
BUF
AD7366/AD7367
V
A1
MUX
V
A2
SCLK
CNVST
CS
BUSY
ADDR
RANGE0
RANGE1
REFSEL
V
DRIVE
T/H
12-/14-BIT
SUCCESSIVE
APPROXIMATION
ADC
OUTPUT
DRIVERS
D
OUT
A
CONTROL
LOGIC
V
B1
MUX
T/H
12-/14-BIT
SUCCESSIVE
APPROXIMATION
ADC
OUTPUT
DRIVERS
D
OUT
B
V
B2
BUF
06703-001
AGND AGND
V
SS
D
CAP
B
DGND
Figure 1.
GENERAL DESCRIPTION
The AD7366/AD7367 are dual 12-bit/14-bit, high speed, low
power, successive approximation analog-to-digital converters
(ADCs) that feature throughput rates up to 1 MSPS. The device
contains two ADCs, each preceded by a 2-channel multiplexer,
and a low noise, wide bandwidth track-and-hold amplifier.
The AD7366/AD7367 are fabricated on the Analog Devices, Inc.,
industrial CMOS process (iCMOS
2
), which is a technology
platform combining the advantages of low and high voltage
CMOS. The
iCMOS
process allows the AD7366/AD7367 to
accept high voltage bipolar signals in addition to reducing
power consumption and package size. The AD7366/AD7367
can accept true bipolar analog input signals in the ±10 V range,
±5 V range, and 0 V to 10 V range.
The AD7366/AD7367 have an on-chip 2.5 V reference that
can be disabled to allow the use of an external reference.
If a 3 V reference is applied to the D
CAP
A and D
CAP
B pins, the
AD7366/AD7367 can accept a true bipolar ±12 V analog input.
Minimum ±12 V V
DD
and V
SS
supplies are required for the
±12 V input range.
1
PRODUCT HIGHLIGHTS
1.
The AD7366/AD7367 can accept true bipolar analog input
signals, as well as ±10 V, ±5 V, ±12 V (with external refer-
ence), and 0 V to 10 V unipolar signals.
Two complete ADC functions allow simultaneous sampling
and conversion of two channels.
1 MSPS serial interface: SPI-/QSPI-/DSP-/MICROWIRE-
compatible interface.
Throughput
Rate
1 MSPS
500 kSPS
1 MSPS
500 kSPS
Number of
Channels
Dual, 2-channel
Dual, 2-channel
Dual, 2-channel
Dual, 2-channel
2.
3.
Table 1. Related Products
Device
AD7366
AD7366-5
AD7367
AD7367-5
1
2
Resolution
12-Bit
12-Bit
14-Bit
14-Bit
Protected by U.S. Patent No. 6,731,232.
iCMOS
Process Technology. For analog systems designers within
industrial/instrumentation equipment OEMs who need high performance
ICs at higher voltage levels,
iCMOS
is a technology platform that enables the
development of analog ICs capable of 30 V and operating at ±15 V supplies
while allowing dramatic reductions in power consumption and package size,
and increased ac and dc performance.
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
www.analog.com
Tel: 781.329.4700
Fax: 781.461.3113 ©2007-2010 Analog Devices, Inc. All rights reserved.
AD7366/AD7367
TABLE OF CONTENTS
Features .............................................................................................. 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 7
Absolute Maximum Ratings ............................................................ 8
ESD Caution .................................................................................. 8
Pin Configuration and Function Descriptions ............................. 9
Typical Performance Characteristics ........................................... 11
Terminology .................................................................................... 14
Theory of Operation ...................................................................... 16
Circuit Information .................................................................... 16
Converter Operation .................................................................. 16
Analog Inputs .............................................................................. 16
Transfer Function ....................................................................... 17
Typical Connection Diagram ................................................... 18
Driver Amplifier Choice ........................................................... 19
Reference ..................................................................................... 19
Modes of Operation ....................................................................... 20
Normal Mode .............................................................................. 20
Shutdown Mode ......................................................................... 21
Power-Up Times ......................................................................... 21
Serial Interface ................................................................................ 22
Microprocessor Interfacing ........................................................... 24
AD7366/AD7367 to ADSP-218x.............................................. 24
AD7366/AD7367 to ADSP-BF53x ........................................... 24
AD7366/AD7367 to TMS320VC5506 ..................................... 25
AD7366/AD7367 to DSP563xx ................................................ 25
Application Hints ........................................................................... 27
Layout and Grounding .............................................................. 27
Outline Dimensions ....................................................................... 28
Ordering Guide .......................................................................... 28
REVISION HISTORY
11/10—Rev. C to Rev. D
Changes to D
OUT
A and D
OUT
B Description in Table 6 ................. 9
Changes to Serial Interface Section .............................................. 22
Changes to Figure 27 ...................................................................... 23
10/10—Rev. B to Rev. C
Changes to D
OUT
A and D
OUT
B Description in Table 6 ................. 9
Changes to Serial Interface Section .............................................. 22
Changes to Figure 27 ...................................................................... 23
8/09—Rev. A to Rev. B
Changes to Table 2 ............................................................................ 4
Changes to Table 3 ............................................................................ 6
9/07—Rev. 0 to Rev. A
Changes to Title ............................................................................... 1
Changes to Specifications ................................................................ 3
Changes to Figure 5 ........................................................................ 11
Changes to Terminology Section.................................................. 14
Changes to Figure 20 ...................................................................... 18
Changes to Figure 28 ...................................................................... 23
Updated Outline Dimensions ....................................................... 28
Changes to Ordering Guide .......................................................... 28
5/07—Revision 0: Initial Version
Rev. D | Page 2 of 28
AD7366/AD7367
SPECIFICATIONS
AV
CC
= DV
CC
= 4.75 V to 5.25 V, V
DD
= 11.5 V to 16.5 V, V
SS
= −16.5 V to −11.5 V, V
DRIVE
= 2.7 V to 5.25 V, f
S
= 1.12 MSPS, f
SCLK
= 48 MHz,
V
REF
= 2.5 V internal/external, T
A
= −40°C to +85°C, unless otherwise noted.
Table 2. AD7366
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise Ratio (SNR)
1
Signal-to-Noise + Distortion Ratio (SINAD)
1
Total Harmonic Distortion (THD)
1
Spurious-Free Dynamic Range (SFDR)
Intermodulation Distortion (IMD)
1
Second-Order Terms
Third-Order Terms
Channel-to-Channel Isolation
1
SAMPLE AND HOLD
Aperture Delay
2
Aperture Jitter
2
Aperture Delay Matching
2
Full Power Bandwidth
DC ACCURACY
Resolution
Integral Nonlinearity (INL)
1
Differential Nonlinearity (DNL)
1
Positive Full-Scale Error
1
Positive Full-Scale Error Match
1
Min
70
70
Typ
72
71
−85
−87
−88
−88
−90
10
40
±100
35
8
12
±0.5
±0.25
±1
±1
±1.5
±0.1
±0.5
±1
±1.5
±0.1
±1
±1
±1.5
±0.1
±1
±0.5
±7
±6
Max
Unit
dB
dB
dB
dB
fa = 49 kHz, fb = 51 kHz
dB
dB
dB
ns
ps
ps
MHz
MHz
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
Test Conditions/Comments
f
IN
= 50 kHz sine wave
−78
−78
@ 3 dB, ±10 V range
@ 0.1 dB, ±10 V range
Zero Code Error
1
Zero Code Error Match
1
±3
±6
Negative Full-Scale Error
1
Negative Full-Scale Error Match
1
±7
±6
Guaranteed no missed codes to 12 bits
±5 V and ±10 V analog input range
0 V to 10 V analog input range
Matching from ADC A to ADC B
Channel-to-channel matching for ADC A and
ADC B
±5 V and ±10 V analog input range
0 V to 10 V analog input range
Matching from ADC A to ADC B
Channel-to-channel matching for ADC A and
ADC B
±5 V and ±10 V analog input range
0 V to 10 V analog input range
Matching from ADC A to ADC B
Channel-to-channel matching for ADC A and
ADC B
Programmed via RANGE pins; see Table 8
ANALOG INPUT
Input Voltage Ranges
±10
±5
0 to 10
±1
V
V
V
µA
pF
pF
kΩ
MΩ
kΩ
MΩ
DC Leakage Current
Input Capacitance
Input Impedance
±0.01
9
13
260
2.5
125
1.2
When in track, ±10 V range
When in track, ±5 V and 0 V to 10 V range
±10 V @ 1 MSPS
±10 V @ 100 kSPS
±5 V and 0 V to 10 V range @ 1 MSPS
±5 V and 0 V to 10 V range @ 100 kSPS
Rev. D | Page 3 of 28
AD7366/AD7367
Parameter
REFERENCE INPUT/OUTPUT
Reference Output Voltage
3
Long-Term Stability
Output Voltage Hysteresis
1
Reference Input Voltage Range
DC Leakage Current
Input Capacitance
D
CAP
A, D
CAP
B Output Impedance
Reference Temperature Coefficient
V
REF
Noise
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Capacitance, C
IN2
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
Floating State Leakage Current
Floating State Output Capacitance
2
CONVERSION RATE
Conversion Time
Track/Hold Acquisition Time
2
Throughput Rate
POWER REQUIREMENTS
V
CC
V
DD
V
SS
V
DRIVE
Normal Mode (Static)
I
DD
I
SS
I
CC
Normal Mode (Operational)
I
DD
I
SS
I
CC
Shutdown Mode
I
DD
I
SS
I
CC
Power Dissipation
Normal Mode (Operational)
Min
2.495
Typ
2.5
150
50
±0.01
25
17
7
6
20
0.7 × V
DRIVE
±0.01
6
V
DRIVE
− 0.2
±0.01
8
0.4
±1
0.8
±1
Max
2.505
Unit
V
ppm
ppm
V
µA
pF
pF
Ω
ppm/°C
µV rms
V
V
µA
pF
V
V
µA
pF
ns
ns
MSPS
MSPS
V
V
V
V
µA
µA
mA
mA
mA
mA
µA
µA
µA
mW
mW
mW
µW
Test Conditions/Comments
±0.2% max @ 25°C
1000 hours
2.5
3.0
±1
External reference applied to Pin D
CAP
A/Pin D
CAP
B
±5 V and ±10 V analog input range
0 V to 10 V analog input range
25
Bandwidth = 3 kHz
V
IN
= 0 V or V
DRIVE
610
140
1.12
1
4.75
+11.5
−16.5
2.7
370
40
1.5
1.8
1.5
5
0.01
0.01
0.3
5.25
+16.5
−11.5
5.25
550
60
2.25
2.0
1.6
5.65
1
1
3
89.1
50
70
1.9
Full-scale step input
4.75 V ≤ V
DRIVE
≤ 5.25 V, f
SCLK
= 48 MHz
2.7 V ≤ V
DRIVE
< 4.75 V, f
SCLK
= 35 MHz
Digital inputs = 0 V or V
DRIVE
See Table 7
See Table 7
See Table 7
V
DD
= +16.5 V
V
SS
= −16.5 V
V
CC
= 5.5 V
f
S
= 1.12 MSPS
V
DD
= +16.5 V
V
SS
= −16.5 V
V
CC
= 5.25 V, internal reference enabled
V
DD
= +16.5 V
V
SS
= −16.5 V
V
CC
= 5.25 V
V
DD
= +16.5 V, V
SS
= −16.5 V, V
CC
= 5.25 V,
f
S
= 1.12 MSPS
±10 V input range, f
S
= 1.12 MSPS
±5 V and 0 V to 10 V input range, f
S
= 1.12 MSPS
V
DD
= +16.5 V, V
SS
= −16.5 V, V
CC
= 5.25 V
Shutdown Mode
1
2
48.75
See the Terminology section.
Sample tested during initial release to ensure compliance.
3
Refers to Pin
D
CAP
A or Pin D
CAP
B
specified for 25
o
C.
Rev. D | Page 4 of 28
AD7366/AD7367
AV
CC
= DV
CC
= 4.75 V to 5.25 V, V
DD
= 11.5 V to 16.5 V, V
SS
= −16.5 V to −11.5 V, V
DRIVE
= 2.7 V to 5.25 V, f
S
= 1 MSPS, f
SCLK
= 48 MHz,
V
REF
= 2.5 V internal/external, T
A
= −40°C to +85°C, unless otherwise noted.
Table 3. AD7367
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise Ratio (SNR)
1
Signal-to-Noise + Distortion Ratio (SINAD)
1
Total Harmonic Distortion (THD)
1
Spurious-Free Dynamic Range (SFDR)
Intermodulation Distortion (IMD)
1
Second-Order Terms
Third-Order Terms
Channel-to-Channel Isolation
1
SAMPLE AND HOLD
Aperture Delay
2
Aperture Jitter
2
Aperture Delay Matching
2
Full Power Bandwidth
DC ACCURACY
Resolution
Integral Nonlinearity (INL)
1
Differential Nonlinearity (DNL)
1
Positive Full-Scale Error
1
Positive Full-Scale Error Match
1
Min
74
73
Typ
76
75
−84
−87
−91
−89
−90
10
40
±100
35
8
14
±2
±0.5
±4
±5
±3
±0.2
±1
±5
±3
±0.2
±4
±5
±3
±0.2
±3.5
±0.90
±20
±20
Max
Unit
dB
dB
dB
dB
fa = 49 kHz, fb = 51 kHz
dB
dB
dB
ns
ps
ps
MHz
MHz
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
Test Conditions/Comments
f
IN
= 50 kHz sine wave
−78
−79
@ 3 dB, ±10 V range
@ 0.1 dB, ±10 V range
Zero Code Error
1
Zero Code Error Match
1
±10
±20
Negative Full-Scale Error
1
Negative Full-Scale Error Match
1
±20
±20
Guaranteed no missed codes to 14 bits
±5 V and ±10 V analog input range
0 V to 10 V analog input range
Matching from ADC A to ADC B
Channel-to-channel matching for ADC A and
ADC B
±5 V and ±10 V analog input range
0 V to 10 V analog input range
Matching from ADC A to ADC B
Channel-to-channel matching for ADC A and
ADC B
±5 V and ±10 V analog input range
0 V to 10 V analog input range
Matching from ADC A to ADC B
Channel-to-channel matching for ADC A and
ADC B
Programmed via RANGE pins; see Table 8
ANALOG INPUT
Input Voltage Ranges
±10
±5
0 to 10
±1
V
V
V
µA
pF
pF
kΩ
MΩ
kΩ
MΩ
DC Leakage Current
Input Capacitance
Input Impedance
±0.01
9
13
260
2.5
125
1.2
When in track, ±10 V range
When in track, ±5 V and 0 V to 10 V range
±10 V @ 1 MSPS
±10 V @ 100 kSPS
±5 V and 0 V to 10 V range @ 1 MSPS
±5 V and 0 V to 10 V range @ 100 kSPS
Rev. D | Page 5 of 28
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