ZSSC3135 Datasheet

© 2016 Integrated Device Technology, Inc.

10

January 27, 2016

2

Circuit Description

2.1.

Signal Flow

The ZSSC3135’s signal path is partly analog and partly digital. The analog section is differential – this means the

differential bridge sensor signal is internally handled via two signal lines that are rejected symmetrically around an

internal common mode potential (analog ground = VDDA/2).

As a result of the differential design, it is possible to amplify positive and negative input signals that are within the

common mode range of the signal input.

Figure 2.1

Block Diagram of the ZSSC3135

ZSSC3135

PGA

ADC

CMC

DAC

BAMP

TS

EEPROM

RAM

ROM

I

Analog

Output

Digital

Data I/O

Analog Domain

Digital Domain

* Note: I

PGA

Programmable Gain Amplifier

TS

On-Chip Temperature Sensor (pn-junction)

External Temperature Sensor (pn-junction)

MUX

Multiplexer

ADC

Analog-to-Digital Converter

CMC

Calibration Microcontroller

ROM

Read-Only Memory for Correction Formula and Algorithm

RAM

Volatile Memory for Calibration Parameters and Configuration

EEPROM

Non-volatile Memory for Calibration Parameters and Configuration

DAC

Digital-to-Analog Converter

BAMP

Output Buffer Amplifier

The differential signal from the bridge sensor is pre-amplified by the programmable gain amplifier (PGA). The

multiplexer (MUX) transmits the signals from either the bridge sensor or the internal or external temperature

sensor to the analog-to-digital converter (ADC) in a specific sequence. The ADC converts these signals into

digital values.