ADS9217 datasheet(20/68 Pages) TI2

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7.3 Feature Description

7.3.1 Analog Inputs

The ADS911x supports both AC-coupled and DC-coupled differential analog inputs. Make sure the input

common-mode voltage of the analog inputs matches the voltage level on the VCMOUT pin. Figure 7-1 shows

the equivalent input network diagram of the device.

0.6

22 pF

AVDD_5V

AINAP

AINBP

AINAM

AINBM

ADC

Figure 7-1. Equivalent Input Network

7.3.2 Analog Input Bandwidth

Figure 6-7 illustrates the analog full-power input bandwidth of the ADS911x. The –3dB bandwidth is 90MHz for

the ADS9119 and ADS9118, and 45MHz for the ADS9117.

7.3.3 ADC Transfer Function

The ADS911x supports a ±3.2V differential input range. The device outputs 18-bit conversion data in either

straight-binary or binary two's-complement format. As shown in Table 7-1, the format for the output codes is the

same across all analog channels. Configure the format for the output codes with the DATA_FORMAT field in

Table 7-1. Transfer Characteristics

INPUT VOLTAGE

DESCRIPTION

ADC OUTPUT IN 2's-

COMPLEMENT FORMAT

ADC OUTPUT IN STRAIGHT-

BINARY FORMAT

≤ –3.2V + 1LSB

Negative full-scale code

0x20000

0x00000

0V + 1LSB

Mid-code

0x00000

0x1FFFF

≥ 3.2V – 1LSB

Positive full-scale code

0x1FFFF

0x3FFFF

ADS9117, ADS9118, ADS9119

SLVSIN3 – MAY 2025

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