FEATURES DESCRIPTION
APPLICATIONS
Internal 2.5V
Reference
RC Oscillator
20MHz
Interface
Circuit
MDATA
IADJ
IOUT
AVDD
ADS1208
REFOUT
REFIN
VIN+
VIN−
MDATA
BVDD
MCLK
M0
M1
MCLK
Buffer
Buffer
Buffer
Buffer
2nd−Order
∆Σ Modulator
BGNDAGND
AVDD
ADS1208
SBAS348A – MARCH 2005 – REVISED MARCH 2005
2nd-Order Delta-Sigma Modulator
with Excitation for Hall Elements
• ± 100mV Specified Input Range The ADS1208 is a 2nd-order ∆ Σ (delta-sigma) modu-
lator operating at a 10MHz clock rate. The specified• ± 125mV Full-Scale Range
input range is ± 100mV, optimized for current• 95dB typ. CMR, 82dB typ. SNR
measurement with a Hall sensor, especially in motor• Adjustable Current Output for Sensor Biasing
control applications. The ADS1208 contains a
• Digital Output Compatible to ADS1202/03 programmable current source for sensor biasing and
has integrated input buffers for fast settling of the• Differential Digital Outputs
sample capacitors; it also requires only a minimum of• Separate 2.7V to 5.5V Digital Supply Pin
external components. The differential analog input
offers low noise and excellent common-mode rejec-
tion.
• Motor Control
• Current Measurement
• Hall Sensors
• Bridge Sensors
• Instrumentation
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Copyright © 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.