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AD7656 Datasheet PDF - Analog Devices

Part Number AD7656
Description (AD7656 - AD7658) Bipolar 12/14/16-Bit ADC
Manufacturers Analog Devices 
Logo Analog Devices Logo 



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AD7656 datasheet, circuit
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Preliminary Technical Data
250 kSPS, 6-Channel,Simultaneous
Sampling, Bipolar 12/14/16-Bit ADC
AD7658/AD7657/AD7656*
FEATURES
6 Independent ADCs
True Bipolar Analog Inputs
Pin/Software Selectable Ranges:- ±10V, ±5V
Fast throughput rate: 250 kSPS
Specified for VCC of 4.5 V to 5.5 V
Low power
160mW at 250 kSPS with 5 V supplies
Wide input bandwidth:
85 dB SNR at 50 kHz input frequency
On-chip Reference and Reference Buffers
Parallel and Serial Interface
High speed serial interface
SPI/QSPI/µWire/DSP compatible
Standby mode: 5 µA max
iCMOSTM Process Technology
64 LQFP package
APPLICATIONS
Power Line Monitoring systems
Instrumentation and control systems
Multi-axis positioning systems
FUNCTIONAL BLOCK DIAGRAM
VDD
CONVSTA CONVSTB CONVSTC
AVCC DVCC
REF
BUF
CLK
OSC
V1 T/H
16-BIT SAR
V2 T/H
V3 T/H
BUF
16-BIT SAR
16-BIT SAR
V4 T/H
V5 T/H
BUF
16-BIT SAR
16-BIT SAR
V6 T/H
VSS
16-BIT SAR
CONTROL
LOGIC
OUTPUT
DRIVERS
+5
SER/PAR
VDRIVE
STBY
DOUTA
SCLK
OUTPUT
DRIVERS
OUTPUT
DRIVERS
DOUTB
DOUTC
OUTPUT
DRIVERS
DATA/
CONTROL
LINES
4,
94
AD7656
AGND
DGND
Figure 1.
GENERAL DESCRIPTION
The AD7658/AD7657/AD7656 contain six 12/14/16-bit, fast, low
power, successive approximation ADCs all in the one package.
The AD7658/AD7657/AD7656 core operates from a single 4.5
V to 5.5 V power supply and features throughput rates up to 250
kSPS. The parts contain low noise, wide bandwidth track-and-
hold amplifiers that can handle input frequencies up to 8 MHz.
signals in the ±10V range and ±5V range . They contain a 2.5V
internal reference and can also accept an external reference. If a
3V external reference is applied to the VREF pin, the ADCs can
accommodate a true bipolar ±12V analog input range. VDD and
VSS supplies of ±12V are required for this ±12V input range.
PRODUCT HIGHLIGHTS
The conversion process and data acquisition are controlled
using CONVST signals and an internal oscillator. Three
CONVST pins allow independent simultaneous sampling of the
three ADC pairs. The AD7658/AD7657/AD7656 have both a
high speed parallel and serial interface allowing the devices to
interface with microprocessors or DSPs. When in Serial
interface mode these parts have a Daisy Chain feature allowing
multiple ADCs to connect to a single serial interface. The
AD7658/AD7657/AD7656 can accommodate true bipolar input
1. Six 12/14/16-bit 250 kSPS ADCs on board.
2. Six true bipolar high impedance analog inputs.
3. The AD7658/AD7657/AD7656 feature both a parallel and
a high speed serial interface.
* Protected by U.S. Patent No. 6,731,232
iCMOSTM 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 30V and operating at +/- 15V supplies while allowing dramatic reductions in power consumption and package size, and
increased AC and DC performance.
Rev. PrI
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.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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AD7656 equivalent
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Preliminary Technical Data
AD7658/AD7657/AD7656
AD7657 SPECIFICATIONS1
Table 2. AVCC = 4.5 V to 5.5 V, VDD = 9.5 V to 16.5 V, VSS = -9.5 V to -16.5V, DVCC = 4.5 V to 5.5 V, VDRIVE = 2.7V to 5.25V, fSAMPLE =
250 kSPS, VREF = 2.5V Internal/External, unless otherwise noted; TA = TMIN to TMAX, unless otherwise noted
Parameter
B Versions1
Unit
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal-to-Noise + Distortion (SINAD2
81
dB min
fIN = 50 kHz sine wave
Signal-to-Noise Ratio (SNR)2
82 dB min
83 dB typ
Total Harmonic Distortion (THD)2
−97 dB typ
Peak Harmonic or Spurious Noise (SFDR)2
−95
dB typ
Intermodulation Distortion (IMD)2
Second-Order Terms
−94 dB typ
Third-Order Terms
−100
dB typ
Aperture Delay
20 ns max
Aperature Delay Matching
2 ns max
100 ps typ
Aperture Jitter
30 ps typ
Full Power Bandwidth
8
MHz typ
@ −3 dB
2.2
MHz typ
@ −0.1 dB
DC ACCURACY
No Missing Codes
14 Bits min
Integral Nonlinearity2
±1.5 LSB typ
Positive Full Scale Error2
±0.4 % FS max
Bipolar Zero Error2
Negative Full Scale Error2
±2.1
mV max
VDD = 5.5 V
±0.4 % FS max
ANALOG INPUT
Input Voltage Ranges
±4xVREF
V
RNG bit/RANGE pin = 0
±2xVREF
V
RNG bit/RANGE pin = 1
DC Leakage Current
±0.3 µA max
Input Capacitance
30 pF typ
REFERENCE INPUT/OUTPUT
Reference output voltage
2.49/2.51
V min/max
Reference input Voltage range
2.5/3
V min/max
DC Leakage current
±0.5
µA max
VREF Pin
Input capacitance
20 pF typ
VREF Output Impedance
1 kOhms typ
Reference temperature Coefficient
25 ppm/°C max
10 ppm/°C typ
LOGIC INPUTS
Input High Voltage, VINH
0.7 x VDRIVE
V min
Input Low Voltage, VINL
0.3 x VDRIVE
V max
Input Current, IIN
Input Capacitance, CIN 3
±0.3
µA max
Typically 10 nA, VIN = 0 V or VCC
10 pF max
LOGIC OUTPUTS
Output High Voltage, VOH
VDRIVE – 0.2
V min
ISOURCE = 200 µA;
Output Low Voltage, VOL
Floating-State Leakage Current
0.4
V max
ISINK = 200 µA
±0.3 µA max
Floating-State Output Capacitance 3
10
pF max
Output Coding
Two’s Complement
CONVERSION RATE
Conversion Time
3 µs max
Track-and-Hold Acquisition Time
500 ns max
Throughput Rate
250 kSPS
POWER REQUIREMENTS
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