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AD7888ARUZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD7888
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
2.7 V to 5.25 V, Micropower, 8-Channel,
125 kSPS, 12-Bit ADC in 16-Lead TSSOP
FUNCTIONAL BLOCK DIAGRAM
SAR + ADC
CONTROL LOGIC
AGND
REF IN/REF OUT
AIN8
AIN1
SCLK
DOUT
DIN
AGND
AD7888
V
DD
CS
T/H
I/P
MUX
BUF
2.5V
REF
CHARGE
REDISTRIBUTION
DAC
SPORT
COMP
FEATURES
Specified for V
DD
of 2.7 V to 5.25 V
Flexible Power/Throughput Rate Management
Shutdown Mode: 1 ␮A Max
Eight Single-Ended Inputs
Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP
Compatible
16-Lead Narrow SOIC and TSSOP Packages
APPLICATIONS
Battery-Powered Systems (Personal Digital Assistants,
Medical Instruments, Mobile Communications)
Instrumentation and Control Systems
High-Speed Modems
GENERAL DESCRIPTION
The AD7888 is a high speed, low power, 12-bit ADC that oper-
ates from a single 2.7 V to 5.25 V power supply. The AD7888 is
capable of a 125 kSPS throughput rate. The input track-and-
hold acquires a signal in 500 ns and features a single-ended
sampling scheme. The AD7888 contains eight single-ended
analog inputs, AIN1 through AIN8. The analog input on each
of these channels is from 0 to V
REF
. The part is capable of con-
verting full power signals up to 2.5 MHz.
The AD7888 features an on-chip 2.5 V reference that can be
used as the reference source for the A/D converter. The REF
IN/REF OUT pin allows the user access to this reference. Alter-
natively, this pin can be overdriven to provide an external refer-
ence voltage for the AD7888. The voltage range for this external
reference is from 1.2 V to V
DD
.
CMOS construction ensures low power dissipation of typically
2 mW for normal operation and 3 µW in power-down mode.
The part is available in a 16-lead narrow body small outline
(SOIC) and a 16-lead thin shrink small outline (TSSOP) package.
PRODUCT HIGHLIGHTS
1. Smallest 12-bit 8-channel ADC; 16-lead TSSOP is the same
area as an 8-lead SOIC and less than half the height.
2. Lowest Power 12-bit 8-channel ADC.
3. Flexible power management options including automatic
power-down after conversion.
4. Analog input range from 0 V to V
REF
(V
DD
).
5. Versatile serial I/O port (SPI/QSPI/MICROWIRE/DSP
Compatible).
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. C
©2010 Analog Devices, Inc. All rights reserved.
AD7888* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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DOCUMENTATION
Data Sheet
• AD7888: 2.7 V to 5.25 V, Micropower, 8-Channel, 125 kSPS,
12-Bit ADC in 16-Lead TSSOP Data Sheet
REFERENCE MATERIALS
Technical Articles
• MS-2210: Designing Power Supplies for High Speed ADC
DESIGN RESOURCES
• AD7888 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD7888 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
DOCUMENT FEEDBACK
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–2–
AD7888–SPECIFICATIONS
(V
DD
= 2.7 V to 5.25 V, REFIN/REFOUT = 2.5 V External/Internal Reference unless
otherwise noted; f
SCLK
= 2 MHz (V
DD
= 2.7 V to 5.25 V); T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Parameter A Version
1
B Version
1
Unit Test Condition/Comment
DYNAMIC PERFORMANCE
Signal to Noise + Distortion Ratio
2, 3
(SNR) 71 71 dB typ f
IN
= 10 kHz Sine Wave, f
SAMPLE
= 125 kSPS
Total Harmonic Distortion
2
(THD) –80 –80 dB typ f
IN
= 10 kHz Sine Wave, f
SAMPLE
= 125 kSPS
Peak Harmonic or Spurious Noise
2
–80 –80 dB typ f
IN
= 10 kHz Sine Wave, f
SAMPLE
= 125 kSPS
Intermodulation Distortion
2
(IMD)
Second Order Terms –78 –78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f
SAMPLE
= 125 kSPS
Third Order Terms –78 –78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f
SAMPLE
= 125 kSPS
Channel-to-Channel Isolation
2
–80 –80 dB typ f
IN
= 25 kHz
Full Power Bandwidth 2.5 2.5 MHz typ @ 3 dB
DC ACCURACY Any Channel
Resolution 12 12 Bits
Integral Nonlinearity
2
± 2 ± 1 LSB max
Differential Nonlinearity
2
± 2 –1/+1.5 LSB max Guaranteed No Missed Codes to 11 Bits (A Grade)
Guaranteed No Missed Codes to 12 Bits (B Grade)
Offset Error ± 6 ± 6 LSB max V
DD
= 4.75 V to 5.25 V (Typically ± 3 LSB)
± 4.5 ± 4.5 LSB max V
DD
= 2.7 V to 3.6 V (Typically ± 2 LSB)
Offset Error Match
2
2 2 LSB typ
Gain Error
2
± 2 ± 2 LSB max Typically 30 LSB with Internal Reference
Gain Error Match
2
3 3 LSB max
ANALOG INPUT
Input Voltage Ranges 0 to V
REF
0 to V
REF
Volts
Leakage Current ± 1 ± 1 µA max
Input Capacitance 38 38 pF typ When in Track
4 4 pF typ When in Hold
REFERENCE INPUT/OUTPUT
REFIN Input Voltage Range 2.5/V
DD
2.5/V
DD
V min/max Functional from 1.2 V
Input Impedance 5 5 kΩ typ Very High Impedance If Internal Reference Disabled
REFOUT Output Voltage 2.45/2.55 2.45/2.55 V min/max
REFOUT Tempco ± 50 ± 50 ppm/°C typ
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 V min V
DD
= 4.75 V to 5.25 V
2.1 2.1 V min V
DD
= 2.7 V to 3.6 V
Input Low Voltage, V
INL
0.8 0.8 V max V
DD
= 2.7 V to 5.25 V
Input Current, I
IN
± 10 ± 10 µA max Typically 10 nA, V
IN
= 0 V or V
DD
Input Capacitance, C
IN
4
10 10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
I
SOURCE
= 200 µA
V
DD
– 0.5 V
DD
– 0.5 V min V
DD
= 2.7 V to 5.25 V
Output Low Voltage, V
OL
0.4 0.4 V max I
SINK
= 200 µA
Floating-State Leakage Current ± 10 ± 10 µA max
Floating-State Output Capacitance
5
10 10 pF max
Output Coding Straight (Natural) Binary
CONVERSION RATE
Throughput Time 16 16 SCLK Cycles Conversion Time + Acquisition Time. 125 kSPS with
2 MHz Clock
Track/Hold Acquisition Time
2
1.5 1.5 SCLK Cycles
Conversion Time 14.5 14.5 SCLK Cycles 7.25 µs (2 MHz Clock)
REV. C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

AD7888ARUZ-REEL7

Mfr. #:
Buy AD7888ARUZ-REEL7
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 2.7V-5.25V Micropwr 8-Ch 125kSPS 12-Bit
Lifecycle:
New from this manufacturer.
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