CS5516 datasheet(11/41 Pages) CIRRUS

11 / 41 page

THEORY OF OPERATION

The front page of this data sheet illustrates the

block diagram of the CS5516 and CS5520 A/D

converter. The device includes an instrumenta-

tion amplifier with a fixed gain of 25. This

chopper-stabilized instrumentation amplifier is

followed by a programmable gain stage with

gain settings of 1, 2, 4, and 8. The sensitivity of

the input is a function of the programmable gain

setting and of the reference voltage connected

between the VREF+ and VREF- pins of the de-

vice. The full scale of the converter is VREF/( G

x 25) in unipolar, or

±VREF/(G x 25) in bipolar,

where VREF is the reference voltage between

the VREF+ and VREF- pins, G is the gain set-

ting of the programmable gain amplifier, and 25

is the gain of the instrumentation amplifier.

After the programmable gain block, the output

of a 4-bit DAC is combined with the input sig-

nal. The DAC can be used to add or subtract

offset from the analog input signal. Offsets as

large as

±200 % of full scale can be trimmed

from the input signal.

The CS5516 and CS5520 are optimized to per-

form ratiometric measurement of bridge-type

transducers. The devices support dc bridge exci-

tation or two modes of ac (switched dc) bridge

excitation. In the switched-dc modes of opera-

tion the converter fully demodulates both the

reference voltage and the analog input signal

from the bridge.

XOUT

VD+

VA+

VREF+

VREF-

DGND

VA-

µF

AIN+

AIN-

MDRV-

0.1

µF

SCLK

SOD

SID

SMODE

CS5516

CS5520

XIN

0.1

µF

Ω

0.1

µF

VD-

AGND2

MDRV+

DRDY

Ω

+5V

Analog

Supply

-5V

Analog

Supply

0.1

µF

µF1 µF

µF

RST

AGND1

320

Unused logic inputs

must be connected

to DGND or VD+

Optional

Clock

Source

Control

Logic

Serial

Data

Interface

Figure 2. System Connection Diagram: DC Excitation Mode (EXC bit = 0), F1 = F0 = 0.

CS5516, CS5520

DS74F1

DS74F2

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