AD4884BBCZ datasheet(14/116 Pages) AD

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Data Sheet

AD4884

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

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Rev. 0 | 14 of 116

Table 6. Pin Function Descriptions (Continued)

Pin Number

Mnemonic

Type1

Description

B5, B6

IN3−ChB

Channel B Negative Analog Input 3.

B7, B14, C1 to C14

−VS

FDA Negative Supply Rail. These supply pins are internally decoupled by two 220nF capacitors to GND.

These pins must be shorted externally.

B8, B9

IN3+ChA

Channel A Positive Analog Input 3.

B10

SJ+ChA

Channel A FDA Summing Junction Positive Node. Sensitive pin, see the Layout Guidelines section.

B11

SJ−ChA

Channel A FDA Summing Junction Negative Node. Sensitive pin, see the Layout Guidelines section.

B12, B13

IN3−ChA

Channel A Negative Analog Input 3.

D1 to D14, E6, E13

+VS

FDA Positive Supply Rail. These supply pins are internally decoupled by two 220nF capacitors to GND.

These pins must be shorted externally.

E1, E8

+VCLAMP

FDA Output Positive Clamp. These pins must be shorted externally and connected to the reference input

pin REFIN.

E2, E3

OUT−ChB

Channel B FDA Negative Output.

E4, E5

OUT+ChB

Channel B FDA Positive Output.

E7, E14

−VCLAMP

FDA Output Negative Clamp. These pins must be shorted externally and connected to ground.

E9, E10

OUT−ChA

Channel A FDA Negative Output.

E11, E12

OUT+ChA

Channel A FDA Positive Output.

VOCM_ChB

Channel B FDA Output Common-Mode Voltage.

CMOChB

Channel B ADC Common-Mode Voltage Output.

F3, F4, F10, F11, P1, P8

DNC

Do Not Connect. Do not connect to these pins.

DISABLE_FDAChB

Channel B FDA Disable Pin. Contains internal pull-up network, can be left floating for normal operation.

VOCM_ChA

Channel A FDA Output Common-Mode Voltage.

CMOChA

Channel A ADC Common-Mode Voltage Output.

F13

DISABLE_FDAChA

Channel A FDA Disable Pin. Contains internal pull-up network, can be left floating for normal operation.

G4 to G6, G11 to G13, H4,

H5, H11, H12, J1, J2, J8,

J9, K1, K2, K8, K9

REFGND

Reference Grounds. Connect any external reference decoupling capacitors across REFIN and REFGND.

All REFGND pins must be connected with a low impedance path to GND.

G7, H7, J7

VDD11ChB

Channel B ADC 1.1V Core Supplies. These supply pins are internally decoupled by four 470nF capacitors

to GND.

When power is supplied to VDDLDO (H6, H13), an internal LDO voltage regulator produces the 1.1V

required at these pins. The voltage regulator is automatically powered on when VDDLDO is driven with a

voltage between 1.4V and 2.7V.

If VDDLDO is left disconnected, the required 1.1V must be supplied to these pins from an external source.

G14, H14, J14

VDD11ChA

Channel A ADC 1.1V Core Supplies. These supply pins are internally decoupled by four 470nF capacitors

to GND.

When power is supplied to VDDLDO (H6, H13), an internal LDO voltage regulator produces the 1.1V

required at these pins. The voltage regulator is automatically powered on when VDDLDO is driven with a

voltage between 1.4V and 2.7V.

If VDDLDO is left disconnected, the required 1.1V must be supplied to these pins from an external source.

H2, H3, H9, H10

VDD33

3.3V Supply Rail Inputs for ADCs. These supply pins are internally decoupled by two 470nF capacitors to

GND. These pins must be shorted externally.

H6, H13

VDDLDO

LDO Supply Rail Input.

This supply rail is internally decoupled by two 220nF capacitors to GND. Four internal, 1.1V, LDO

voltage regulators (two per ADC) can be supplied from a source connected to this input in the 1.4V to

2.7V range. If this pin is left open, all four internal regulators automatically power off and VDD11ChA,

VDD11ChB, IOVDDChA, and IOVDDChB must be connected with an external voltage source within their

allowed specification limits.

If VDDLDO is connected to a voltage source, VDD11ChA, VDD11ChB, IOVDDChA, and IOVDDChB must not

be connected to any external voltage source.

These pins must be shorted externally.

K6, K13

IOGND

Digital Interface Supply Ground Reference. These pins must be connected to the same ground plane as

all other GND pins.

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