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AD7883BN Datasheet PDF : 12 Pages
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AD7883
ABSOLUTE MAXIMUM RATINGS*
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
VINA, VINB to AGND (Figure 4) . . . . . –0.3 V to VDD + 0.3 V
VINA to AGND (Figure 5) . . . . . . –VDD –0.3 V to VDD + 0.3 V
VREF to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to VDD
Digital Inputs to DGND . . . . . . . . . . . –0.3 V to VDD + 0.3 V
Digital Outputs to DGND . . . . . . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . 10 mW/°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those listed in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PIN CONFIGURATION
VINA 1
VINB 2
AGND 3
VREF 4
CS 5
CONVST 6
RD 7
BUSY 8
CLKIN 9
DGND 10
DB0 11
DB1 12
AD7883
TOP VIEW
(Not to Scale)
24 VDD
23 MODE
22 DB11
21 DB10
20 DB9
19 DB8
18 DB7
17 DB6
16 DB5
15 DB4
14 DB3
13 DB2
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7883 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
PIN FUNCTION DESCRIPTION
Pin
Pin
No.
Mnemonic Function
11
VINA
12
VINB
13
AGND
14
VREF
15
CS
16
CONVST
17
RD
18
BUSY
19
CLKIN
10
DGND
11 . . . 22 DB0–DB11
23
MODE
24
VDD
Analog Input.
Analog Input.
Analog Ground.
Voltage Reference Input. This is normally tied to VDD.
Chip Select. Active Low Logic input. The device is selected when this input is active.
Convert Start. A low to high transition on this input puts the track/hold into hold mode and starts
conversion. This input is asynchronous to the CLKIN and is independent of CS and RD.
Read. Active Low Logic Input. This input is used in conjunction with CS low to enable data outputs.
Active Low Logic Output. This status line indicates converter status. BUSY is low during conversion.
Clock Input. TTL-compatible logic input. Used as the clock source for the A/D converter. The mark/
space ratio of the clock can vary from 40/60 to 60/40.
Digital Ground.
Three-State Data Outputs. These become active when CS and RD are brought low.
MODE Input. This input is used to put the device into the power save mode (MODE = 0 V). During
normal operation, the MODE input will be a logic high (MODE = VDD).
Power Supply. This is nominally +3.3 V.
–4–
REV. 0
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