ds8102 Maxim Integrated Products, Inc., ds8102 Datasheet

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ds8102

Manufacturer Part Number
ds8102
Description
Dual Delta-sigma Modulator And Encoder
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
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.
Rev 1; 2/09
Typical Operating Circuit appears at end of data sheet.
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
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.
Single-Phase Electricity Metering
Three-Phase Electricity Metering
Power-Line Conditioning
Electrochemical and Optical Sensors
Industrial Control
Data-Acquisition Systems and Data Loggers
Dual Delta-Sigma Modulator and Encoder
________________________________________________________________ Maxim Integrated Products
General Description
Applications
♦ Dual Delta-Sigma 2nd-Order Modulators
♦ Selectable Internal or External Voltage Reference
♦ Manchester-Encoded Bit Stream Output
♦ Selectable Internal or External Clock Source
♦ Integrated Low-Power 8MHz Oscillator
♦ Operating Mode
+ Denotes a lead(Pb)-free/RoHS-compliant package.
DS8102+
PART
Channel 0: Pin-Selectable Gain of 1x, 4x, 16x,
Channel 1: Fixed Gain of 1x
Includes Synchronization Bits to Allow Clock
Single-Pin Transmission Scheme Simplifies
Active Mode (8MHz, V
DGND
AGND
or 32x
Recovery
Electrical Isolation Using Capacitive Coupling
AN1+
AN0+
AN1-
AN0-
V
V
REF
DD
TOP VIEW
1
2
3
4
5
6
7
8
+
-40°C to +85°C
TEMP RANGE
Ordering Information
TSSOP
DS8102
DD
Pin Configuration
= 3.6V): 3.5mA
PIN-PACKAGE
16
15
14
13
12
11
10
9
Features
16 TSSOP
V
APDREF
RST
MNOUT
CLKIO
G1
G0
CLKSEL
DD
1

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ds8102 Summary of contents

Page 1

... 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. ...

Page 2

Dual Delta-Sigma Modulator and Encoder ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to DGND.............-0.3V to +4.0V DD Voltage Range on V Relative to AGND .............-0.3V to +4.0V DD Voltage Range on AGND Relative to DGND .........-0.3V to +0.3V Voltage ...

Page 3

Dual Delta-Sigma Modulator and Encoder ELECTRICAL CHARACTERISTICS (continued 2.7V to 3.6V -40°C to +85° PARAMETER SYMBOL ANALOG-TO-DIGITAL CONVERTER DYNAMIC SPECIFICATIONS DC Power-Supply Rejection Ratio Signal-to-Noise Ratio SINAD Total Harmonic Distortion (to 21st Harmonic) ...

Page 4

... Positive Input for Differential Analog Input Channel Digital and Analog Power Supply DD Clock Select Input. When CLKSEL = 0, the DS8102 uses its internal 8MHz oscillator as a clock source. 9 CLKSEL When CLKSEL = 1, the DS8102 operates from an external clock source (which must be provided at CLKIO). ...

Page 5

... DS8102 are now in their lowest cur- rent consumption modes. Shutdown Mode 3) Exit stop mode. 4) Drive the RST line on the DS8102 high to return the DS8102 to active mode. Note: The RST line on the DS8102 does not include a pullup. This means that if the RST line is not dri- ...

Page 6

... Upon exit from shutdown mode (V RST = 1), the 8MHz oscillator is started. 2) The DS8102 delays for 16 cycles of the 8MHz oscil- lator. This allows the 8MHz oscillator to warm up. 3) The AFE is enabled. 4) The DS8102 delays for 8192 cycles of the 8MHz oscillator ...

Page 7

... REF desired. Table 2 summarizes the modes of operation for the DS8102 based on the APDREF input. The level at APDREF should be set when the DS8102 is in shut- down mode. Internal/External Clock Selection The configuration input pin CLKSEL selects whether the DS8102 uses the internal 8MHz oscillator or an external clock (provided at CLKIO) when performing conver- sions ...

Page 8

... For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 16 TSSOP 8 _______________________________________________________________________________________ DGND APDREF AGND 15 V RST 14 REF DS8102 AN1- MNOUT 13 CLKIO AN1+ 12 AN0 AN0 CLKSEL 9 DD LINE SUPPLY CURRENT SHUNT PACKAGE CODE ...

Page 9

... Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2009 Maxim Integrated Products DESCRIPTION from 12MHz to 8MHz; XCLK(MAX) from 83ns to 125ns; changed the Offset Error parameter Maxim is a registered trademark of Maxim Integrated Products, Inc. Revision History PAGES CHANGED — 1 ...

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