DS8102 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Dual Delta-Sigma Modulator and Encoder

Rev 1; 2/09
Dual Delta-Sigma Modulator and Encoder
General Description
The DS8102 is a stand-alone, dual-channel, delta-
sigma modulator that converts measurements from two
differential analog input pairs into a Manchester-encod-
ed output bit stream that can be processed by a com-
panion microcontroller such as the MAXQ3108. One
channel operates at a fixed 1x gain, while the other
operates at a pin-selectable gain of 1x, 4x, 16x, or 32x.
The DS8102 includes an internal power-supply monitor,
on-board voltage reference, and low-power oscillator to
reduce the number of external components required for
data acquisition.
The Manchester-encoded output from the DS8102
combines pulse-density-modulated measurement val-
ues from both differential input channels with a syn-
chronization bit stream and is transmitted over a single
pin. This transmission scheme is ideal for split voltage
domain applications where the DS8102 and other “hot”-
side components must be electrically isolated from
“cold” low-voltage components such as a companion
microcontroller. In this type of application, the DS8102
can be capacitively coupled to a companion microcon-
troller with only two connection points required
(MNOUT and DGND).
The MAXQ3108 dual-core microcontroller, which
includes specialized Manchester bit-stream decoding
inputs and sinc3 filters, is specifically designed to act
as a companion microcontroller for up to three DS8102
devices. This configuration, which supports up to six
differential analog input channels, is well suited for
three-phase electricity-metering applications.
Applications
Single-Phase Electricity Metering
Three-Phase Electricity Metering
Power-Line Conditioning
Electrochemical and Optical Sensors
Industrial Control
Data-Acquisition Systems and Data Loggers
Features
♦ Dual Delta-Sigma 2nd-Order Modulators
Channel 0: Pin-Selectable Gain of 1x, 4x, 16x,
or 32x
Channel 1: Fixed Gain of 1x
♦ Selectable Internal or External Voltage Reference
♦ Manchester-Encoded Bit Stream Output
Includes Synchronization Bits to Allow Clock
Recovery
Single-Pin Transmission Scheme Simplifies
Electrical Isolation Using Capacitive Coupling
♦ Selectable Internal or External Clock Source
♦ Integrated Low-Power 8MHz Oscillator
♦ Operating Mode
Active Mode (8MHz, V_DD = 3.6V): 3.5mA
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS8102+
-40°C to +85°C
16 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
DGND 1
+
AGND 2
V_REF 3
AN1- 4
AN1+ 5
AN0- 6
AN0+ 7
V_DD 8
DS8102
TSSOP
16 V_DD
15 APDREF
14 RST
13 MNOUT
12 CLKIO
11 G1
10 G0
9 CLKSEL
Typical Operating Circuit appears at end of data sheet.
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.