10-Bit, 40 MSPS, 3 V, 74 mW
A/D Converter
AD9203
FEATURES
CMOS 10-Bit, 40 MSPS sampling A/D converter
Power dissipation: 74 mW (3 V supply, 40 MSPS)
17 mW (3 V supply, 5 MSPS)
Operation between 2.7 V and 3.6 V supply
Differential nonlinearity: −0.25 LSB
Power-down (standby) mode, 0.65 mW
ENOB: 9.55 @ f
IN
= 20 MHz
Out-of-range indicator
Adjustable on-chip voltage reference
IF undersampling up to f
IN
= 130 MHz
Input range: 1 V to 2 V p-p differential or single-ended
Adjustable power consumption
Internal clamp circuit
CLAMP
CLAMPIN
AINP
AINN
SHA
A/D
REFTF
REFBF
BANDGAP
REFERENCE
+
–
0.5V
AVSS
PWRCON
DFS
DRVSS
CORRECTION LOGIC
D/A
GAIN
A/D
SHA
D/A
GAIN
3-STATE
A/D
FUNCTIONAL BLOCK DIAGRAM
CLK
AVDD
DRVDD
AD9203
STBY
OUTPUT BUFFERS
10
OTR
D9 (MSB)
D0 (LSB)
00573-001
VREF
REFSENSE
Figure 1.
APPLICATIONS
CCD imaging
Video
Portable instrumentation
IF and baseband communications
Cable modems
Medical ultrasound
GENERAL DESCRIPTION
The AD9203 is a monolithic low power, single supply, 10-bit,
40 MSPS analog-to-digital converter, with an on-chip voltage
reference. The AD9203 uses a multistage differential pipeline
architecture and guarantees no missing codes over the full
operating temperature range. Its input range may be adjusted
between 1 V and 2 V p-p.
The AD9203 has an onboard programmable reference. An
external reference can also be chosen to suit the dc accuracy
and temperature drift requirements of an application.
An external resistor can be used to reduce power consumption
when operating at lower sampling rates. This yields power
savings for users who do not require the maximum sample rate.
This feature is especially useful at sample rates far below 40
MSPS. Excellent performance is still achieved at reduced power.
For example, 9.7 ENOB performance may be realized with only
17 mW of power, using a 5 MHz clock.
A single clock input is used to control all internal conversion
cycles. The digital output data is presented in straight binary or
twos complementary output format by using the DFS pin. An
Rev. B
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.
out-of-range signal (OTR) indicates an overflow condition that
can be used with the most significant bit to determine over- or
underrange.
The AD9203 can operate with a supply range from 2.7 V to 3.6
V, an attractive option for low power operation in high-speed
portable applications.
The AD9203 is specified over industrial (−40°C to +85°C)
temperature ranges and is available in a 28-lead TSSOP package.
PRODUCT HIGHLIGHTS
Low Power—The
AD9203 consumes 74 mW on a 3 V supply
operating at 40 MSPS. In standby mode, power is reduced to
0.65 mW.
High Performance—Maintains
better than 9.55 ENOB at 40
MSPS input signal from dc to Nyquist.
Very Small Package—The
AD9203 is available in a 28-lead
TSSOP.
Programmable Power—The
AD9203 power can be further
reduced by using an external resistor at lower sample rates.
Built-In Clamp Function—Allows
dc restoration of video
signals.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
AD9203
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Characteristics .............................................................. 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Terminology ...................................................................................... 7
Typical Performance Characteristics ............................................. 8
Operations ....................................................................................... 11
Theory of Operation .................................................................. 11
Operational Modes..................................................................... 11
Input and Reference Overview ................................................. 12
Internal Reference Connection ................................................ 12
External Reference Operation .................................................. 13
Clamp Operation........................................................................ 13
Driving the Analog Input.......................................................... 13
Op Amp Selection Guide .......................................................... 14
Differential Mode of Operation ............................................... 15
Power Control............................................................................. 16
Interfacing to 5 V Systems ........................................................ 16
Clock Input and Considerations .............................................. 16
Digital Inputs and Outputs ....................................................... 16
Applications..................................................................................... 18
Direct IF Down Conversion ..................................................... 18
Ultrasound Applications ........................................................... 19
Evaluation Board ............................................................................ 20
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
REVISION HISTORY
8/04—Data sheet changed from Rev. A to Rev. B
Changes to Table 5.......................................................................... 16
4/01—Data sheet changed from Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to TPC 2 ............................................................................. 8
Added Figures 41 to 46 .................................................................. 23
7/99—Revision 0: Initial Version
Rev. B | Page 2 of 28
AD9203
SPECIFICATIONS
AVDD = 3 V, DRVDD = 3 V, F
S
= 40 MSPS, input span from 0.5 V to 2.5 V, internal 1 V reference, PWRCON = AVDD, 50% clock duty
cycle, T
MIN
to T
MAX
unless otherwise noted.
Table 1.
Parameter
RESOLUTION
MAX CONVERSION RATE
PIPELINE DELAY
DC ACCURACY
Differential Nonlinearity
Integral Nonlinearity
Offset Error
Gain Error
ANALOG INPUT
Input Voltage Range
Input Capacitance
Aperture Delay
Aperture Uncertainty (Jitter)
Input Bandwidth (–3 dB)
Input Referred Noise
INTERNAL REFERENCE
Output Voltage (0.5 V Mode)
Output Voltage (1 V Mode)
Output Voltage Tolerance (1 V Mode)
Load Regulation
POWER SUPPLY
Operating Voltage
Analog Supply Current
Digital Supply Current
Power Consumption
Power-Down
Power Supply Rejection Ratio
DYNAMIC PERFORMANCE (AIN = 0.5 dBFS)
Signal-to-Noise and Distortion
f = 4.8 MHz
f = 20 MHz
Effective Bits
f = 4.8 MHz
f = 20 MHz
Signal-to-Noise Ratio
f = 4.8 MHz
f = 20 MHz
Total Harmonic Distortion
f = 4.8MHz
f = 20 MHz
Spurious-Free Dynamic Range
f = 4.8 MHz
1
f = 20 MHz
1
1
1
Symbol
F
S
Min
40
Typ
10
Max
5.5
DNL
INL
E
ZS
E
FS
AIN
C
IN
T
AP
T
AJ
BW
1
1.4
2.0
1.2
390
0.3
0.5
1
±5
0.65
2.7
2.7
3.0
3.0
20.1
4.4
9.5
74
88.8
0.65
0.04
± 0.25 ± 0.7
± 0.65 ± 1.4
± 0.6 ± 2.8
± 0.7 ± 4.0
LSB
LSB
% FSR
% FSR
2
Unit
Bits
MSPS
Clock
Cycles
Conditions
V p-p
pF
ns
ps rms
MHz
mV
V
V
mV
mV
V
V
mA
mA
mA
mW
mW
mW
% F
S
Switched, Single-Ended
REFSENSE = VREF
REFSENSE = GND
1.0 mA Load
VREF
VREF
± 30
1.2
3.6
3.6
22.0
6.0
14.0
84.0
108.0
1.2
± 0.25
AVDD
DRVDD
IAVDD
IDRVDD
f
IN
= 4.8 MHz, Output Bus Load = 10pF
f
IN
= 20 MHz, Output Bus Load = 20 pF
f
IN
= 4.8 MHz, Output Bus Load = 10pF
f
IN
= 20 MHz, Output Bus Load = 20 pF
P
D
PSRR
SINAD
57.2
ENOB
9.2
SNR
57.5
THD
59.7
59.3
9.6
9.55
60.0
59.5
−76.0
−74.0
dB
dB
Bits
Bits
dB
dB
dB
dB
dB
dB
−65.0
SFDR
67.8
80
78
Rev. B | Page 3 of 28
AD9203
Parameter
Two-Tone Intermodulation Distortion
Differential Phase
Differential Gain
DIGITAL INPUTS
High Input Voltage
Low Input Voltage
Clock Pulse Width High
Clock Pulse Width Low
Clock Period
2
DIGITAL OUTPUTS
High-Z Leakage
Data Valid Delay
Data Enable Delay
Data High-Z Delay
LOGIC OUTPUT (with DRVDD = 3 V)
High Level Output Voltage (I
OH
= 50 µA)
High Level Output Voltage (I
OH
= 0.5 mA)
Low Level Output Voltage (I
OL
= 1.6 mA)
Low Level Output Voltage (I
OL
= 50 µA)
Symbol
IMD
DP
DG
V
IH
V
IL
Min
Typ
68
0.2
0.3
Max
Unit
dB
Degree
%
V
V
ns
ns
ns
µA
ns
ns
ns
V
V
V
V
Output = 0 to DRVDD
C
L
= 20 pF
C
L
= 20 pF
C
L
= 20 pF
Conditions
f = 44.49 MHz and 45.52 MHz
NTSC 40 IRE Ramp
2.0
0.4
11.25
11.25
25
I
OZ
t
OD
t
DEN
t
DHZ
V
OH
V
OH
V
OL
V
OL
2.95
2.80
± 5.0
5
6
6
0.3
0.05
1
2
Differential Input (2 V p-p).
The AD9203 will convert at clock rates as low as 20 kHz.
N
N–1
ANALOG
INPUT
N+1
N+2
N+3
N+4
N+6
N+5
CLOCK
DATA
OUT
N–7
N–6
N–5
N–4
N–3
N–2
N–1
N
N+1
00573-002
T
OD
= 3ns MIN
7ns MAX
(C
LOAD
= 20pF)
Figure 2. Timing Diagram
Rev. B | Page 4 of 28
AD9203
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
AVDD
DRVDD
AVSS
AVDD
REFCOM
CLK
Digital Outputs
AINP
VREF
REFSENSE
REFTF, REFBF
STBY
CLAMP
CLAMPIN
PWRCON
DFS
3-STATE
Junction
Temperature
Storage
Temperature
Lead
Temperature
(10 s)
With
Respect to
AVSS
DRVSS
DRVSS
DRVDD
AVSS
AVSS
DRVSS
AINN
AVSS
AVSS
AVSS
AVSS
AVSS
AVSS
AVSS
AVSS
AVSS
Min
–0.3
–0.3
–0.3
–3.9
–0.3
–0.3
–0.3
AVSS
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
Max
+3.9
+3.9
+0.3
+3.9
+0.3
AVDD + 0.3
DRVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
AVDD + 0.3
150
+150
300
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
°C
°C
°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum ratings for extended periods may affect
device reliability.
–65
THERMAL CHARACTERISTICS
28-Lead TSSOP
J
A
= 97.9°C/W
J
C
= 14.0°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. B | Page 5 of 28
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