AD7765 datasheet(28/32 Pages) AD

Part #	AD7765

Description	24-Bit, 156 kSPS, 112 dB 誇-? ADC with On-Chip Buffers and Serial Interface

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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28 / 32 page

AD7765

Rev. 0 | Page 28 of 32

GAIN REGISTER—ADDRESS 0x0004

Non-Bit-Mapped, Default Value 0xA000

The gain register is scaled such that 0x8000 corresponds to a

gain of 1.0. The default value of this register is 1.25 (0xA000).

This results in a full-scale digital output when the input is at

80% of VREF, tying in with the maximum analog input range of

±80% of VREF p-p.

OVERRANGE REGISTER—ADDRESS 0x0005

Non-Bit-Mapped, Default Value 0xCCCC

The overrange register value is compared with the output of the

first decimation filter to obtain an overload indication with

minimum propagation delay. This is prior to any gain scaling or

offset adjustment. The default value is 0xCCCC, which corre-

sponds to 80% of VREF (the maximum permitted analog input

voltage). Assuming VREF = 4.096 V, the bit is then set when the

input voltage exceeds approximately 6.55 V p-p differential. The

overrange bit is set immediately if the analog input voltage

exceeds 100% of VREF for more than four consecutive samples at

the modulator rate.

AD7765 Datasheet(PDF) 28 Page - Analog Devices