AD7870SQ Analog Devices Inc, AD7870SQ Datasheet - Page 9

• Manufacturer Part Number: AD7870SQ
• Description: IC ADC 12BIT SAMPLING 3V 24-CDIP
• Manufacturer: Analog Devices Inc

Specifications of AD7870SQ

• Rohs Status: RoHS non-compliant
• Number Of Bits: 12
• Sampling Rate (per Second): 100k
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Power Dissipation (max): 95mW
• Voltage Supply Source: Dual ±
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 24-CDIP (0.300", 7.62mm)

DIP and SOIC
Pin No.
18
19
20
21
22
23
24
Table 6. Output Data for Byte Interfacing
HBEN
High
Low
PLCC
Pin No.
21
23
24
25
26
27
28
DB7/Low
Low
DB7
Mnemonic
AGND
REF OUT
V
V
12/8/CLK
CONVST
CS
IN
SS
DB6/Low
Low
DB6
Function
Analog Ground. Ground reference for track-and-hold, reference and DAC.
Voltage Reference Output. The internal 3 V reference is provided at this pin. The external load capability is
500 μA.
Analog Input. The analog input range is ±3 V for the AD7870, ±10 V for the AD7876, and 0 V to +5 V for the
AD7875.
Negative Supply, −5 V ± 5%.
Three Function Input. Defines the data format and serial clock format. With this pin at +5 V, the output
data for-mat is 12-bit parallel only. With this pin at 0 V, either byte or serial data is available and SCLK is
not continuous. With this pin at −5 V, either byte or serial data is again available but SCLK is now
continuous.
Convert Start. A low to high transition on this input puts the track-and-hold into its hold mode and
starts conversion. This input is asynchronous to the CLK input.
Chip Select. Active low logic input. The device is selected when this input is active. With CONVST tied
low, a new conversion is initiated when CS goes low.
DB5/Low
Low
DB5
Rev. C | Page 9 of 28
DB4/Low
Low
DB4
DB3/DB11
DB11(MSB)
DB3
DB2/DB10
DB10
DB2
AD7870/AD7875/AD7876
DB1/DB9
DB9
DB1
DB0/DB8
DB8
DB0 (LSB)