AD7655-EP Datasheet, PDF (1/12 Pages) Analog Devices – Low Cost, 4-Channel, 16-Bit 1 MSPS PulSAR ADC

Low Cost, 4-Channel, 16-Bit 1 MSPS
PulSAR ADC
AD7655-EP
FEATURES
4-channel, 16-bit resolution ADC
2 track-and-hold amplifiers
Throughput
1 MSPS (normal mode)
888 kSPS (impulse mode)
Analog input voltage range: 0 V to 5 V
No pipeline delay
Parallel and serial 5 V/3 V interface
SPI®/QSPI™/MICROWIRE™/DSP compatible
Single 5 V supply operation
Power dissipation
120 mW typical
2.6 mW @ 10 kSPS
48-lead frame chip scale package (LFCSP)
Pin-to-pin compatible with the AD7654
Low cost
Supports defense and aerospace applications (AQEC
standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
Enhanced product change notification
Qualification data available on request
APPLICATIONS
AC motor control
3-phase power control
4-channel data acquisition
Uninterrupted power supplies
Communications
GENERAL DESCRIPTION
The AD7655-EP is a low cost, simultaneous sampling, dual-
channel, 16-bit, charge redistribution SAR, analog-to-digital
converter that operates from a single 5 V power supply. It
contains two low noise, wide bandwidth, track-and-hold
amplifiers that allow simultaneous sampling, a high speed
16-bit sampling ADC, an internal conversion clock, error
correction circuits, and both serial and parallel system interface
ports. Each track-and-hold has a multiplexer in front to provide
a 4-channel input ADC. The A0 multiplexer control input
allows the choice of simultaneously sampling input pairs
INA1/INB1 (A0 = low) or INA2/ INB2 (A0 = high). The part
features a very high sampling rate mode (normal) and, for low
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND REFGND REFx
DVDD DGND
INA1
INAN
INA2
A0
INB1
INBN
INB2
PD
RESET
TRACK/HOLD
×2
MUX
MUX ^SWITCHED
CAP DAC
MUX
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
SERIAL
PORT ₁₆
PARALLEL
INTERFACE
AD7655-EP
IMPULSE
CNVST
Figure 1.
OVDD
OGND
D[15:0]
SER/PAR
EOC
BUSY
CS
RD
A/B
BYTESWAP
Table 1. PulSAR® Selection
Type/kSPS
Pseudo
Differential
True Bipolar
True
Differential
18 Bit
Multichannel/
Simultaneous
100 to 250
AD7660/
AD7661
AD7663
AD7675
AD7678
500 to 570
AD7650/
AD7652
AD7664/
AD7666
AD7665
AD7676
AD7679
AD7654
800 to
1000
AD7653
AD7667
>1000
AD7671
AD7677
AD7674
AD7655
AD7621
AD7623
AD7641
power applications, a reduced power mode (impulse) where the
power is scaled with the throughput. Operation is specified
from −55°C to +125°C.
Full details about this enhanced product are available in the
AD7655 data sheet, which should be consulted in conjunction
with this data sheet.
PRODUCT HIGHLIGHTS
1. Multichannel ADC.
The AD7655-EP features 4-channel inputs with two sample-
and-hold circuits that allow simultaneous sampling.
2. Fast Throughput.
The AD7655-EP is a 1 MSPS, charge redistribution, 16-bit
SAR ADC with internal error correction circuitry.
3. Single-Supply Operation.
The AD7655-EP operates from a single 5 V supply. In impulse
mode, its power dissipation decreases with throughput.
4. Serial or Parallel Interface.
Versatile parallel or 2-wire serial interface arrangements
are compatible with both 3 V and 5 V logic.
Rev. A
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