LTC1605-1/LTC1605-2
Single Supply 16-Bit, 100ksps,
Sampling ADCs
FeaTures
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DescripTion
The
LTC
®
1605-1/LTC1605-2
are 100ksps, sampling
16-bit A/D converters that draw only 55mW (typical) from
a single 5V supply. These easy-to-use devices include a
sample-and-hold, precision reference, switched capacitor
successive approximation A/D and trimmed internal clock.
The LTC1605-1’s input range is 0V to 4V while the
LTC1605-2’s input range is ±4V. An external reference
can be used if greater accuracy over temperature is
needed.
The ADC has a microprocessor compatible, 16-bit or two
byte parallel output port. A convert start input and a data
ready signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.
L,
LTC and LT are registered trademarks of Linear Technology Corporation.
Sample Rate: 100ksps
Complete 16-Bit Solution on a Single 5V Supply
Unipolar Input Range: 0V to 4V (LTC1605-1)
Bipolar Input Range:
±4V
(LTC1605-2)
Power Dissipation: 55mW Typ
Signal-to-Noise Ratio: 86dB Typ
Operates with Internal or External Reference
Internal Synchronized Clock
28-Pin SSOP Package
applicaTions
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Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
Typical applicaTion
LTC1605-1 Low Power, 100kHz, 16-Bit Sampling ADC on 5V Supply
5V
10 F
28
27
6 TO 13
15 TO 22
D15 TO D0
V
DIG
V
ANA
0V TO 4V 200
INPUT
33.2k
2.5V
2.2 F
3 REF
4 CAP
BUFFER
4k
2.5V
REFERENCE
AGND2
5
DGND
14
1605-1/2 TA01
0.1 F
Typical INL Curve
2.0
1.5
1 V
IN
4k
16-BIT
SAMPLING ADC
20k
10k
INL (LSBs)
16-BIT
OR 2 BYTE
PARALLEL
BUS
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384
32768
CODE
1605-1/2 TA02/G04
BUSY
26
CONTROL
LOGIC AND
TIMING
CS
25
R/C 24
BYTE 23
DIGITAL
CONTROL
SIGNALS
2.5V
2.2 F
49152
65535
AGND1
2
160512fa
For more information
www.linear.com/LTC1605-1
1
LTC1605-1/LTC1605-2
absoluTe MaxiMuM raTings
(Notes 1, 2)
V
ANA
..........................................................................7V
V
DIG
to V
ANA
............................................................0.3V
V
DIG
...........................................................................7V
Ground Voltage Difference
DGND, AGND1 and AGND2 ................................±0.3V
Analog Inputs (Note 3)
V
IN
.....................................................................±25V
CAP............................. V
ANA
+ 0.3V to AGND2 – 0.3V
REF ....................................Indefinite Short to AGND2
Momentary Short to V
ANA
Digital Input Voltage (Note 4)......... V
DGND
– 0.3V to 10V
Digital Output Voltage ........ V
DGND
– 0.3V to V
DIG
+ 0.3V
Power Dissipation .............................................. 500mW
Operating Ambient Temperature Range
LTC1605-1C/LTC1605-2C ......................... 0°C to 70°C
LTC1605-1I/LTC1605-2I .......................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
pin conFiguraTion
TOP VIEW
V
IN
1
AGND1 2
REF 3
CAP 4
AGND2 5
D15 (MSB) 6
D14 7
D13 8
D12 9
D11 10
D10 11
D9 12
D8 13
DGND 14
28 V
DIG
27 V
ANA
26
BUSY
25
CS
24 R/C
23 BYTE
22 D0
21 D1
20 D2
19 D3
18 D4
17 D5
16 D6
15 D7
V
IN
1
AGND1 2
REF 3
CAP 4
AGND2 5
D15 (MSB) 6
D14 7
D13 8
D12 9
D11 10
D10 11
D9 12
D8 13
DGND 14
N PACKAGE
28-LEAD PDIP
T
JMAX
= 125°C,
θ
JA
= 130°C/W
TOP VIEW
28 V
DIG
27 V
ANA
26
BUSY
25
CS
24 R/C
23 BYTE
22 D0
21 D1
20 D2
19 D3
18 D4
17 D5
16 D6
15 D7
G PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 95°C/W
EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB
OBSOLETE PACKAGE
2
160512fa
For more information
www.linear.com/LTC1605-1
LTC1605-1/LTC1605-2
orDer inForMaTion
LEAD FREE FINISH
LTC1605-1CG#PBF
LTC1605-1IG#PBF
LTC1605-2CG#PBF
LTC1605-2IG#PBF
LTC1605-1CN#PBF
LTC1605-1IN#PBF
LTC1605-2CN#PBF
LTC1605-2IN#PBF
TAPE AND REEL
LTC1605-1CG#TRPBF
LTC1605-1IG#TRPBF
LTC1605-2CG#TRPBF
LTC1605-2IG#TRPBF
LTC1605-1CN#TRPBF
LTC1605-1IN#TRPBF
LTC1605-2CN#TRPBF
LTC1605-2IN#TRPBF
PART MARKING
LTC1605-1CG
LTC1605-1IG
LTC1605-2CG
LTC1605-2IG
LTC1605-1CN
LTC1605-1IN
LTC1605-2CN
LTC1605-2IN
PACKAGE DESCRIPTION
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead PDIP
28-Lead PDIP
28-Lead PDIP
28-Lead PDIP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
OBSOLETE PACKAGE
Consult factory for Military grade parts.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part markings, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
converTer characTerisTics
PARAMETER
Resolution
No Missing Codes
Transition Noise
Integral Linearity Error
Zero Error
Zero Error Drift
Full-Scale Error Drift
Full-Scale Error
Full-Scale Error Drift
Power Supply Sensitivity
V
ANA
= V
DIG
= V
DD
(Note 7)
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. With external reference (Notes 5, 6).
MIN
l
l
TYP
MAX
UNITS
Bits
Bits
16
15
1
±3
±10
±2
±7
LSB
RMS
LSB
mV
ppm/°C
ppm/°C
±0.50
%
ppm/°C
±8
LSB
l
l
Ext. Reference = 2.5V (Note 8)
Ext. Reference = 2.5V (Notes 12, 13)
Ext. Reference = 2.5V
V
DD
= 5V ±5% (Note 9)
l
±2
analog inpuT
SYMBOL PARAMETER
V
IN
C
IN
R
IN
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
4.75V ≤ V
ANA
≤ 5.25V, 4.75V ≤ V
DIG
≤ 5.25V
LTC1605-1
LTC1605-2
l
l
MIN
TYP
0 to 4
±4
10
10
MAX
UNITS
V
V
pF
kΩ
Analog Input Range (Note 9)
Analog Input Capacitance
Analog Input Impedance
160512fa
For more information
www.linear.com/LTC1605-1
3
LTC1605-1/LTC1605-2
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. (Notes 5, 14)
SYMBOL PARAMETER
S/(N + D) Signal-to-(Noise + Distortion) Ratio
CONDITIONS
1kHz Input Signal (Note 14)
10kHz Input Signal
20kHz, –60dB Input Signal
1kHz Input Signal, First 5 Harmonics
10kHz Input Signal, First 5 Harmonics
1kHz Input Signal
10kHz Input Signal
(Note 15)
MIN
TYP
87
85
30
–101
-92
–101
-92
275
40
Sufficient to Meet AC Specs
Full-Scale Step (Note 9)
(Note 16)
150
2
µs
ns
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
kHz
ns
DynaMic accuracy
THD
Total Harmonic Distortion
Peak Harmonic or Spurious Noise
Full-Power Bandwidth
Aperture Delay
Aperture Jitter
Transient Response
Overvoltage Recovery
inTernal reFerence characTerisTics
PARAMETER
V
REF
Output Voltage
V
REF
Output Tempco
Internal Reference Source Current
External Reference Voltage for Specified Linearity
External Reference Current Drain
CAP Output Voltage
(Notes 9, 10)
Ext. Reference = 2.5V (Note 9)
I
OUT
= 0
CONDITIONS
I
OUT
= 0
I
OUT
= 0
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
l
TYP
2.500
±5
1
MAX
2.520
UNITS
V
ppm/°C
µA
2.470
2.30
l
2.50
2.50
2.70
100
V
µA
V
DigiTal inpuTs anD DigiTal ouTpuTs
SYMBOL PARAMETER
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
C
OZ
I
SOURCE
I
SINK
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage D15 to D0
Hi-Z Output Capacitance D15 to D0
Output Source Current
Output Sink Current
V
DD
= 4.75V
V
DD
= 4.75V
CONDITIONS
VDD = 5.25V
V
DD
= 4.75V
V
IN
= 0V to V
DD
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
l
l
l
TYP
MAX
0.8
±10
UNITS
V
V
µA
pF
V
V
V
2.4
5
I
O
= –10µA
I
O
= –200µA
I
O
= 160µA
I
O
= 1.6mA
V
OUT
= 0V to V
DD
,
CS
High
CS
High (Note 9)
V
OUT
= 0V
V
OUT
= V
DD
l
l
l
l
4.5
4.0
0.05
0.10
0.4
±10
15
–10
10
V
µA
pF
mA
mA
4
160512fa
For more information
www.linear.com/LTC1605-1
LTC1605-1/LTC1605-2
TiMing characTerisTics
SYMBOL
t
CONV
t
ACQ
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t10
t11
t12
PARAMETER
Conversion Time
Acquisition Time
Convert Pulse Width
Data Valid Delay After R/C↓
BUSY
Delay from R/C↓
BUSY
Low
BUSY
Delay After End of Conversion
Aperture Delay
Bus Relinquish Time
BUSY
Delay After Data Valid
Previous Data Valid After R/C↓
R/C to
CS
Setup Time
Time Between Conversions
Bus Access and Byte Delay
(Notes 9, 10)
(Notes 9, 10)
10
10
10
83
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
l
l
l
MIN
100
TYP
MAX
8
2
UNITS
kHz
µs
µs
ns
µs
ns
µs
ns
ns
f
SAMPLE(MAX)
Maximum Sampling Frequency
(Note 11)
(Note 9)
C
L
= 50pF
l
l
l
40
8
65
8
220
40
10
50
35
200
7.4
83
ns
ns
µs
ns
µs
ns
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL
V
DD
I
DD
P
DIS
PARAMETER
Positive Supply Voltage
Positive Supply Current
Power Dissipation
CONDITIONS
(Notes 9, 10)
l
power requireMenTs
MIN
4.75
TYP
11
55
MAX
5.25
16
80
V
UNITS
mA
mW
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltage values are with respect to ground with DGND, AGND1
and AGND2 wired together (unless otherwise noted).
Note 3:
When these pin voltages are taken below ground or above V
ANA
=
V
DIG
= V
DD
, they will be clamped by internal diodes. This product can
handle input currents of greater than 100mA below ground or above V
DD
without latch-up.
Note 4:
When these pin voltages are taken below ground, they will be
clamped by internal diodes. This product can handle input currents of
90mA below ground without latchup. These pins are not clamped to V
DD
.
Note 5:
V
DD
= 5V, f
SAMPLE
= 100kHz, t
r
= t
f
= 5ns unless otherwise
specified.
Note 6:
Linearity, offset and full-scale specifications apply for a V
IN
input
with respect to ground.
Note 7:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual end points of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 8:
Zero error for the LTC1605-1 is the voltage measured from
0.5LSB when the output code flickers between 0000 0000 0000 0000
and 0000 0000 0000 0001. Zero error for the LTC1605-2 is the voltage
measured from – 0.5LSB when the output code flickers between 0000
0000 0000 0000 and 1111 1111 1111 1111.
Note 9:
Guaranteed by design, not subject to test.
Note 10:
Recommended operating conditions.
Note 11:
With
CS
low the falling R/C edge starts a conversion. If R/C
returns high at a critical point during the conversion it can create small
errors. For best results ensure that R/C returns high within 3µs after the
start of the conversion.
Note 12:
As measured with fixed resistors shown in Figure 4. Adjustable to
zero with external potentiometer.
Note 13:
Full-scale error is the untrimmed deviation from ideal last code
transition, divided by the full-scale range and includes the effect of offset
error.
Note 14:
All specifications in dB are referred to a full-scale 4V input for the
LTC1605-1 and to ±4V input for the LTC1605-2.
Note 15:
Full-power bandwidth is defined as full-scale input frequency
at which a signal-to-(noise + distortion) degrades to 60dB or 10 bits of
accuracy.
Note 16:
Recovers to specified performance after (±20V) input
overvoltage for the LTC1605-1 and ±15V for the LTC1605-2.
160512fa
For more information
www.linear.com/LTC1605-1
5
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