AD7885BQ Analog Devices Inc, AD7885BQ Datasheet - Page 7

• Manufacturer Part Number: AD7885BQ
• Description: IC ADC 16BIT SAMPLING HS 28-CDIP
• Manufacturer: Analog Devices Inc

Specifications of AD7885BQ

• Rohs Status: RoHS non-compliant
• Number Of Bits: 16
• Sampling Rate (per Second): 166k
• Data Interface: Parallel
• Number Of Converters: 2
• Power Dissipation (max): 325mW
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-CDIP (0.600", 15.24mm)

AD7884
V
V
± 3V
± 3V
± 5V
± 5V
AGNDS
AGNDF
AV
AV
GND
V
V
CONVST
CS
RD
BUSY
DB0–DB15
DGND
V
V
REV. E
INV
REF–
SS
DD
REF+
REF+
DD
SS
IN
IN
IN
IN
F
S
S
F
S
F
AD7885
V
V
± 3V
± 5V
± 5V
AGNDS
AGNDF
AV
AV
GND
V
V
CONVST
CS
RD
HBEN
BUSY
DB0–DB7
DGND
V
V
INV
REF–
SS
DD
REF+
REF+
DD
SS
IN
IN
IN
F
S
S
F
AD7885A
V
V
± 3V
± 3V
± 5V
± 5V
AGNDS
AGNDF
AV
AV
GND
V
V
CONVST
CS
RD
HBEN
BUSY
DB0–DB7
DGND
V
V
INV
REF–
SS
DD
REF+
REF+
DD
SS
IN
IN
IN
IN
F
S
S
F
S
F
Description
This pin is connected to the inverting terminal of an op amp, as in Figure 6, and allows
the inversion of the supplied 3 V reference.
This is the negative reference input and can be obtained by using an external amplifier to
invert the positive reference input. In this case, the amplifier output is connected to V
See Figure 6.
This is the analog input sense pin for the ± 3 V analog input range on the AD7884 and
AD7885A.
This is the analog input force pin for the ± 3 V analog input range on the AD7884 and
AD7885A. When using this input range, the ± 5V
AGND.
This is the analog input pin for the ± 3 V analog input range on the AD7885. When using
this input range, the ± 5V
This is the analog input sense pin for the ±5 V analog input range on the AD7884, AD7885,
and AD7885A.
This is the analog input force pin for the ±5 V analog input range on the AD7884, AD7885,
and AD7885A. When using this input range, the ± 3V
to AGND.
This is the ground return sense pin for the 9-bit ADC and the on-chip residue amplifier.
This is the ground return force pin for the 9-bit ADC and the on-chip residue amplifier.
Positive analog power rail for the sample-and-hold amplifier and the residue amplifier.
Negative analog power rail for the sample-and-hold amplifier and the residue amplifier.
This is the ground return for the sample-and-hold section.
Negative Supply for the 9-Bit ADC
Positive Supply for the 9-Bit ADC and All Device Logic
This asynchronous control input starts conversion.
Chip Select Control Input
Read Control Input. This is used in conjunction with CS to read the conversion result
from the device output latch.
High Byte Enable. Active high control input for the AD7885. It selects either the high or
the low byte of the conversion for reading.
Busy Output. The BUSY output goes low when the conversion begins and stays low until
it is completed, at which time it goes high.
16-Bit Parallel Data-Word Output on the AD7884
8-Bit Parallel Data Byte Output on the AD7885
Ground Return for All Device Logic
Reference Force Input
Reference Sense Input. The device operates from a 3 V reference.
PIN FUNCTION DESCRIPTIONS
–7–
IN
F and ± 5V
IN
S pins should be tied to AGND.
IN
F and ± 5V
IN
F and ± 3V
AD7884/AD7885
IN
S pins should be tied to
IN
S pins should be tied
REF–
.