Texas Instruments ADS7816 Datasheet
ADS7816
DESCRIPTION
The ADS7816 is a 12-bit, 200kHz sampling analogto-digital converter. It features low power operation
with automatic power down, a synchronous serial
interface, and a differential input. The reference voltage can be varied from 100mV to 5V, with a corresponding resolution from 24µV to 1.22mV.
Low power, automatic power down, and small size
make the ADS7816 ideal for battery operated systems
or for systems where a large number of signals must be
acquired simultaneously. It is also ideal for remote
and/or isolated data acquisition. The ADS7816 is
available in an 8-pin plastic mini-DIP, an 8-lead SOIC,
or an 8-lead MSOP package.
12-Bit High Speed Micro Power Sampling
ANALOG-TO-DIGITAL CONVERTER
®
©
1996 Burr-Brown Corporation PDS-1355B Printed in U.S.A., March, 1997
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
FEATURES
● 200kHz SAMPLING RATE
● MICRO POWER:
1.9mW at 200kHz
150
µW at 12.5kHz
● POWER DOWN: 3
µA Max
● 8-PIN MINI-DIP, SOIC, AND MSOP
● DIFFERENTIAL INPUT
● SERIAL INTERFACE
APPLICATIONS
● BATTERY OPERATED SYSTEMS
● REMOTE DATA ACQUISITION
● ISOLATED DATA ACQUISITION
SAR
Control
Serial
Interface
D
OUT
Comparator
S/H Amp
CS/SHDN
DCLOCK
+In
V
REF
–In
CDAC
OPA658
ADS7816
ADS7816
SBAS061
2
®
ADS7816
SPECIFICATIONS
At –40°C to +85°C, +VCC = +5V, V
REF
= +5V, f
SAMPLE
= 200kHz, f
CLK
= 16 • f
SAMPLE
, unless otherwise specified.
ADS7816 ADS7816B ADS7816C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Span +In – (–In) 0
V
REF
✻✻✻✻V
Absolute Input Voltage +In –0.2
V
CC
+0.2
✻✻✻✻V
–In –0.2 +0.2 ✻✻✻✻V
Capacitance 25 ✻✻pF
Leakage Current ±1 ✻✻µA
SYSTEM PERFORMANCE
Resolution 12 ✻✻Bits
No Missing Codes 11 12 ✻ Bits
Integral Linearity Error ±0.5 ±2 ±0.5 ±2 ±0.5 ±1 LSB
(1)
Differential Linearity Error ±0.5 ±2 ±0.5 ±1 ±0.25 ±0.75 LSB
Offset Error ±4 ✻✻LSB
Gain Error ±4 ✻✻LSB
Noise 33 ✻✻µVrms
Power Supply Rejection 82 ✻✻dB
SAMPLING DYNAMICS
Conversion Time 12 ✻✻
Clk Cycles
Acquisition Time 1.5 ✻✻
Clk Cycles
Throughput Rate 200 ✻✻kHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion V
IN
= 5.0Vp-p at 1kHz –84 ✻✻dB
V
IN
= 5.0Vp-p at 5kHz –82 ✻✻dB
SINAD V
IN
= 5.0Vp-p at 1kHz 72 ✻✻dB
Spurious Free Dynamic Range V
IN
= 5.0Vp-p at 1kHz 86 ✻✻dB
REFERENCE INPUT
Voltage Range 0.1 5 ✻✻✻✻V
Resistance
CS = GND, f
SAMPLE
= 0Hz
5 ✻✻GΩ
CS = V
CC
5 ✻✻GΩ
Current Drain At Code 710h 38 100 ✻✻ ✻✻µA
f
SAMPLE
= 12.5kHz
2.4 20 ✻✻ ✻✻µA
CS = V
CC
0.001 3 ✻✻ ✻✻µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻✻
Logic Levels:
V
IH
IIH = +5µA3
+V
CC
+0.
3 ✻✻✻✻V
V
IL
IIL = +5µA –0.3 0.8 ✻✻✻✻V
V
OH
IOH = –250µA 3.5 ✻✻V
V
OL
IOL = 250µA 0.4 ✻✻V
Data Format Straight Binary ✻✻
POWER SUPPLY REQUIREMENTS
V
CC
Specified Performance 4.50 5.25 ✻✻✻✻V
Quiescent Current 380 700 ✻✻ ✻✻µA
f
SAMPLE
= 12.5kHz
(2, 3)
30 ✻✻µA
f
SAMPLE
= 12.5kHz
(3)
280 400 ✻✻µA
Power Down
CS =
VCC, f
SAMPLE
= 0Hz
3 ✻✻µA
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻✻✻°C
✻ Specifications same as grade to the left.
NOTE: (1) LSB means Least Significant Bit, with V
REF
equal to +5V, one LSB is 1.22mV. (2) f
CLK
= 3.2MHz, CS = VCC for 251 clock cycles out of every 256. (3) See
the Power Dissipation section for more information regarding lower sample rates.
3
®
ADS7816
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from performance degradation to complete device failure. BurrBrown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet
published specifications.
ABSOLUTE MAXIMUM RATINGS
(1)
+VCC.....................................................................................................+6V
Analog Input........................................................... –0.3V to (+V
CC
+ 0.3V)
Logic Input ............................................................. –0.3V to (+V
CC
+ 0.3V)
Case Temperature ......................................................................... +100°C
Junction Temperature .................................................................... +150°C
Storage Temperature ..................................................................... +125°C
External Reference Voltage ..............................................................+5.5V
NOTE: (1) Stresses above these ratings may permanently damage the device.
PIN CONFIGURATION
PIN ASSIGNMENTS
PIN NAME DESCRIPTION
1V
REF
Reference Input.
2 +In Non Inverting Input.
3 –In Inverting Input. Connect to ground or to remote ground sense point.
4 GND Ground.
5 CS/SHDN Chip Select when LOW, Shutdown Mode when HIGH.
6D
OUT
The serial output data word is comprised of 12 bits of data. In operation the data is valid on the falling edge of DCLOCK. The
second clock pulse after the falling edge of CS enables the serial output. After one null bit the data is valid for the next 12 edges.
7 DCLOCK Data Clock synchronizes the serial data transfer and determines conversion speed.
8+V
CC
Power Supply.
PACKAGE/ORDERING INFORMATION
MAXIMUM MAXIMUM
INTEGRAL DIFFERENTIAL PACKAGE
LINEARITY ERROR LINEARITY ERROR TEMPERATURE DRAWING
PRODUCT (LSB) (LSB) RANGE PACKAGE NUMBER
(1)
ADS7816P ±2 ±2 –40°C to +85°C Plastic DIP 006
ADS7816U ±2 ±2 –40°C to +85°C SOIC 182
ADS7816E ±2 ±2 –40°C to +85°C MSOP 337
ADS7816PB ±2 ±1 –40°C to +85°C Plastic DIP 006
ADS7816UB ±2 ±1 –40°C to +85°C SOIC 182
ADS7816EB ±2 ±1 –40°C to +85°C MSOP 337
ADS7816PC ±1 ±0.75 –40°C to +85°C Plastic DIP 006
ADS7816UC ±1 ±0.75 –40°C to +85°C SOIC 182
ADS7816EC ±1 ±0.75 –40°C to +85°C MSOP 337
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book.
1
2
3
4
8
7
6
5
+VCC
DCLOCK
D
OUT
CS/SHDN
V
REF
+In
–In
GND
ADS7816
8-Pin PDIP,
8-Lead SOIC,
8-Lead MSOP
4
®
ADS7816
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VCC = +5V, V
REF
= +5V, f
SAMPLE
= 200kHz, and f
CLK
= 16 • f
SAMPLE
, unless otherwise specified.
CHANGE IN OFFSET vs REFERENCE VOLTAGE
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
Change in Offset (LSB)
12345
Reference Voltage (V)
CHANGE IN OFFSET vs TEMPERATURE
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
Delta from 25°C (LSB)
–55 –40 –25 0 25 70 85
Temperature (°C)
CHANGE IN GAIN vs REFERENCE VOLTAGE
4
3.5
3
2.5
2
1.5
1
0.5
0
Change in Gain (LSB)
12345
Reference Voltage (V)
CHANGE IN GAIN vs TEMPERATURE
0.15
0.1
0.05
0
–0.05
–0.1
–0.15
Delta from 25°C (LSB)
–55 –40 –25 0 25 70 85
Temperature (°C)
EFFECTIVE NUMBER OF BITS
vs REFERENCE VOLTAGE
12
11.75
11.5
11.25
11
10.75
10.5
10.25
10
Effective Number of Bits (rms)
0.1 1 10
Reference Voltage (V)
PEAK-TO-PEAK NOISE vs REFERENCE VOLTAGE
10
9
8
7
6
5
4
3
2
1
0
Peak-to-Peak Noise (LSB)
0.1 1 10
Reference Voltage (V)
5
®
ADS7816
SIGNAL-TO-(NOISE + DISTORTION) vs INPUT LEVEL
80
70
60
50
40
30
20
10
0
Signal-to-(Noise Ratio Plus Distortion) (dB)
–40 –35 –30 –25 –20 –15 –10 –5 0
Input Level (dB)
SIGNAL-TO-(NOISE + DISTORTION) vs FREQUENCY
100
90
80
70
60
50
40
30
20
10
0
Signal-to-(Noise + Distortion) (dB)
1 10 100
Frequency (kHz)
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VCC = +5V, V
REF
= +5V, f
SAMPLE
= 200kHz, and f
CLK
= 16 • f
SAMPLE
, unless otherwise specified.
POWER SUPPLY REJECTION vs RIPPLE FREQUENCY
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
Power Supply Rejection (dB)
1 10 100 1000 10000
Ripple Frequency (kHz)
TOTAL HARMONIC DISTORTION vs FREQUENCY
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
Total Harmonic Distortion (dB)
1 10 100
Frequency (kHz)
FREQUENCY SPECTRUM
(2048 Point FFT; f
IN
= 9.9kHz, –0.5dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
Amplitude (dB)
0 255075100
Frequency (kHz)
SPURIOUS FREE DYNAMIC RANGE and
SIGNAL-TO-NOISE RATIO vs FREQUENCY
100
90
80
70
60
50
40
30
20
10
0
Spurious Free Dynamic Range
and Signal-to-Noise Ratio (dB)
1 10 100
Frequency (kHz)
Spurious Free Dynamic Range
Signal-to-Noise Ratio
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