AD7985 Analog Devices, AD7985 Datasheet - Page 8

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AD7985

Manufacturer Part Number
AD7985
Description
16-Bit, 2.5 MSPS PulSAR 11 mW ADC in QFN
Manufacturer
Analog Devices
Datasheet

Specifications of AD7985

Resolution (bits)
16bit
# Chan
1
Sample Rate
2.5MSPS
Interface
Ser,SPI
Analog Input Type
SE-Uni
Ain Range
(Vref) p-p,Uni (Vref)
Adc Architecture
SAR
Pkg Type
CSP
AD7985
Pin No.
19
20
21
1
AI = analog input, AI/O = bidirectional analog, DI = digital input, DO = digital output, and P = power.
Mnemonic
BVDD
REFIN
Exposed Pad
Type
P
AI/O
EP
1
Description
Reference Buffer Power. Nominally at 5.0 V. If an external reference buffer is used to achieve the maximum
SNR performance with a 5 V reference, the reference buffer must be powered down by connecting the
REFIN pin to ground. The external reference buffer must be connected to the BVDD pin.
Internal Reference Output/Reference Buffer Input.
When PDREF is low, the internal band gap reference produces a 1.2 V (typical) voltage on this pin,
which needs external decoupling (0.1 µF typical).
When PDREF is high, use an external reference to provide 1.2 V (typical) to this pin.
When PDREF is high and REFIN is low, the on-chip reference buffer and the band gap reference are
powered down. An external reference must be connected to REF and BVDD.
The exposed pad is not connected internally. For increased reliability of the solder joints, it is
recommended that the pad be soldered to the system ground plane.
Rev. A | Page 8 of 28

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