CS5374 datasheet(6/44 Pages) CIRRUS

6 / 44 page

CS5374

DS862F1

ANALOG CHARACTERISTICS (CONT.)

Notes: 9. The upper bandwidth limit is determined by the selected digital filter cut-off frequency.

10. Anti-alias capacitors are discrete external components and must be of good quality (C0G, NPO, poly).

Poor-quality capacitors will degrade total harmonic distortion (THD) performance. See Figure 1 for

external anti-alias filter connections.

11. Maximum integrated noise over the measurement bandwidth for the voltage reference device attached

to the VREF inputs.

Parameter

Symbol

Min

Typ

Max

Unit

Modulator Inputs

Input Signal Frequencies

(Note 9)

VBW

2000

Full-scale Differential AC Input

VAC

Vpp

Full-scale Differential DC Input

VDC

-2.5

2.5

VDC

Input Common Mode Voltage

VCM

(VA-)+2.5

-V

Input Voltage Range (Vcm ±Signal)

VRNG

(VA-)+0.7

(VA+)-1.25

Differential Input Impedance

INR±

INF±

ZDIFINR

ZDIFINF

Single-ended Input Impedance

INR±

INF±

ZSEINR

ZSEINF

External Anti-alias Filter

Series Resistance

(Note 10)

Differential Capacitance

RAA

CDIFF

680

VREF Inputs

[VREF+] - [VREF-]

(Note 2, 3)

VREF

2.500

VREF-

(Note 4)VREF-

VA -

VREF Input Current

VREFII

-120

µA

VREF Input Noise

(Note 11)VREFIN

µVrms

MODULATOR

INR+

INF+

INF-

INR-

20nF

C0G

20nF

C0G

680

AMPLIFIER

OUT+

OUT-

680

CS5374

Figure 1. External Anti-alias Filter Components

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