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ADS1205 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer ADS1205
Beschreibung DELTA-SIGMA MODULATOR
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 29 Seiten
ADS1205 Datasheet, Funktion
ADS1205
SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
Two 1ĆBit, 10MHz, 2ndĆOrder
DeltaĆSigma Modulators
FEATURES
D 16-Bit Resolution
D 14-Bit Linearity
D ±2.5V Input Range at 2.5V
D Internal Reference Voltage: 2%
D Gain Error: 0.5%
D Two Independent Delta-Sigma Modulators
D Two Input Reference Buffers
D On-Chip 20MHz Oscillator
D Selectable Internal or External Clock
D Operating Temperature Range:
−40°C to +85°C
D QFN-24 (4x4) Package
APPLICATIONS
D Motor Control
D Current Measurement
D Industrial Process Control
D Instrumentation
D Resolver
DESCRIPTION
The ADS1205 is a two-channel, high-performance,
delta-sigma (∆Σ) modulator with more than 98dB dynamic
range, operating from a single +5V supply. The differential
inputs are ideal for direct connection to transducers in an
industrial environment. 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. Effective resolution of 14 bits can be obtained with
a digital filter bandwidth of 40kHz at a modulator rate of
10MHz. The ADS1205 is designed for use in
high-resolution measurement applications including
current measurements, smart transmitters, industrial
process control, and resolvers. It is available in a QFN-24
(4x4) package.
CH A+
CH A
REFIN A
CH B+
CH B
REFIN B
AVDD
2nd−Order
∆Σ Modulator
2nd−Order
∆Σ Modulator
BVDD
Output
Interface
Circuit
OUT A
OUT B
C LK OUT
Divider
Clock
Select
C LK IN
C LK SE L
REFOUT
Reference
Voltage
2.5V
Out EN
RC
Oscillator
20MHz
AGND
BGND
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 2005−2007, Texas Instruments Incorporated
www.ti.com






ADS1205 Datasheet, Funktion
ADS1205
SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
PIN ASSIGNMENT
RGE PACKAGE
QFN−24
(TOP VIEW)
REFIN B 1
AGND 2
AVDD
AVDD
AGND
3
4
5
CLKSEL 6
ADS1205(1)
18 REFIN A
17 AGND
16 AVDD
15 AVDD
14 REFOUT
13 AGND
www.ti.com
(1) The thermal pad is internally connected to the substrate. This pad can be connected to the analog ground or left floating. Keep the thermal pad
separate from the digital ground, if possible.
(2) NC = No Connection.
Terminal Functions
TERMINAL
NAME
NO.
REFIN B
1
AGND
2, 5, 13, 17
AVDD
CLKSEL
3, 4, 15, 16
6
CLKIN
7
BVDD
BGND
8
9
CLKOUT
10
OUT B
11
OUT A
12
REFOUT
REFIN A
14
18
NC 19, 24
CH A+
CH A−
CH B−
CH B+
20
21
22
23
I/O DESCRIPTION
I Reference voltage input of channel B: pin for external reference voltage
Analog ground
Analog power supply; nominal 5V
I Clock select between internal clock (CLKSEL = 1) or external clock (CLKSEL = 0)
I External clock input
Digital interface power supply; from 2.7V to 5.5V
Interface ground
O System clock output
O Bit stream from channel B modulator
O Bit stream from channel A modulator
O Reference voltage output: output pin of the internal reference source; nominal 2.5V
I Reference voltage input of channel A: pin for external reference voltage
No connection; this pin is left unconnected
I Analog input of channel A: noninverting input
I Analog input of channel A: inverting input
I Analog input of channel B: inverting input
I Analog input of channel B: noninverting input
6

6 Page









ADS1205 pdf, datenblatt
ADS1205
SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
www.ti.com
TYPICAL CHARACTERISTICS (continued)
AVDD = 5V, BVDD = 3V, CH x+ = 0.5V to 4.5V, CH x− = 2.5V, REFIN = REFOUT = internal +2.5V, CLKIN = 20MHz, and 16-bit Sinc3 filter with
decimation by 256, unless otherwise noted.
11.0
10.8
10.6
10.4
10.2
10.0
9.8
9.6
9.4
9.2
9.0
40
CLOCK FREQUENCY vs TEMPERATURE
20 0 20 40 60 80
Temperature (_ C)
100
Figure 26
10.2
10.1
10.0
9.9
9.8
9.7
9.6
9.5
9.4
9.3
9.2
4.5
CLOCK FREQUENCY vs POWER SUPPLY
4.75 5 5.25
Power Supply (V)
Figure 27
5.5
12

12 Page





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