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PDF ADS1203IPWT Data sheet ( Hoja de datos )
| Número de pieza | ADS1203IPWT | |
| Descripción | MOTOR CONTROL CURRENT MEASUREMENT | |
| Fabricantes | Burr-Brown Corporation | |
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ADS1203
Motor Control Current Measurement
1ĆBit, 10MHz, 2ndĆOrder, DeltaĆSigma Modulator
SBAS318 − JUNE 2004
FEATURES
D 16-Bit Resolution
D 14-Bit Linearity
D ±250mV Input Range with Single +5V Supply
D 1% Internal Reference Voltage
D 1% Gain Error
D Flexible Serial Interface with Four Different
Modes
D Implemented Twinned Binary Coding as
Split-Phase or Manchester Coding for
One-Line Interfacing
D Operating Temperature Range:
−40°C to +85°C
APPLICATIONS
D Motor Control
D Current Measurement
D Industrial Process Control
D Instrumentation
D Smart Transmitters
D Portable Instruments
D Weight Scales
D Pressure Transducers
VIN+
VIN−
VDD
GND
DESCRIPTION
The ADS1203 is a delta-sigma (∆Σ) modulator with a
95dB dynamic range, operating from a single +5V
supply. The differential inputs are ideal for direct
connection to transducers or low-level signals. With the
appropriate digital filter and modulator rate, the device
can be used to achieve 16-bit analog-to-digital (A/D)
conversion with no missing codes. An effective
resolution of 14 bits or SNR of 85dB (typical) can be
maintained with a digital filter bandwidth of 40kHz at a
modulator rate of 10MHz. The ADS1203 is designed for
use in medium- to high-resolution measurement
applications including current measurements, smart
transmitters, industrial process control, weigh scales,
chromatography, and portable instrumentation. It is
available in an 8-lead TSSOP package. A 16-pin QFN
(3x3) package will be available soon.
2nd−Order
∆Σ Modulator
RC Oscillator
20MHz
Buffer
Reference
Voltage
2.5V
Interface
Circuit
MDAT
MCLK
M0
M1
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2004, Texas Instruments Incorporated
www.ti.com
1 page  
www.ti.com
EQUIVALENT INPUT CIRCUIT
VDD
AIN
RON = 350Ω C(SAMPLE) = 5pF
GND
Diode Turn-on Voltage: 0.4V
Equivalent Analog Input Circuit
PIN ASSIGNMENTS
TSSOP PACKAGE
(TOP VIEW)
M0 1
VIN+ 2
VIN− 3
M1 4
ADS1203
8 VDD
7 MCLK
6 MDAT
5 GND
ADS1203
SBAS318 − JUNE 2004
VDD
DIN
GND
Equivalent Digital Input Circuit
Terminal Functions
TERMINAL
NAME NO. I/O
DESCRIPTION
M0 1 I Mode input
VIN+
VIN−
M1
2 AI Noninverting analog input
3 AI Inverting analog input
4 I Mode input
GND
5 P Power supply ground
MDAT
6 O Modulator data output
MCLK
7 I/O Modulator clock input or output
VDD
8 P Power supply: +5V nominal
NOTE: AI = analog input, AO = analog output, I = input, O = output,
P = power supply.
5
5 Page 
ADS1203
www.ti.com
SBAS318 − JUNE 2004
TYPICAL CHARACTERISTICS (continued)
VDD = +5V, VIN+ = −250mV to +250mV, VIN− = 0V, MCLK input = 20MHz, and 16-bit Sinc3 filter, with OSR = 256, unless otherwise noted.
0
−20
−40
−60
−80
−100
−120
−140
0
FREQUENCY SPECTRUM
(4096 Point FFT, fIN = 1kHz, 0.5VPP)
5 10 15
Frequency (kHz)
20
0
−20
−40
−60
−80
−100
−120
−140
0
FREQUENCY SPECTRUM
(4096 Point FFT, fIN = 5kHz, 0.5VPP)
5 10 15
Frequency (kHz)
20
CLOCK FREQUENCY vs TEMPERATURE
10.8
10.5
10.2
9.9
9.6
9.3
−40
−20
0 20 40 60
Temperature (_ C)
80 100
10.5
CLOCK FREQUENCY vs POWER SUPPLY
10.3
10.1
9.9
9.7
9.5
4.5
4.7 4.9 5.1 5.3
Power Supply (V)
5.5
110
105
100
95
90
85
80
75
70
65
60
1
COMMON−MODE REJECTION RATIO
vs FREQUENCY
10
Input Frequency (kHz)
100
90
85
80
75
70
65
60
55
50
0.1
POWER−SUPPLY REJECTION RATIO
vs FREQUENCY
1 10
Frequency of Power Supply (kHz)
100
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADS1203IPWT.PDF ] | |
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