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PDF ADS1205 Data sheet ( Hoja de datos )
| Número de pieza | ADS1205 | |
| Descripción | DELTA-SIGMA MODULATOR | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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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
1 page  
ADS1205
www.ti.com
SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
ELECTRICAL CHARACTERISTICS (continued)
Over recommended operating free-air temperature range at −40°C to +85°C, 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.
PARAMETER
Digital Inputs(7)
TEST CONDITIONS
ADS1205I
MIN TYP(1)
MAX UNITS
Logic family
LVCMOS
VIH High-level input voltage
VIL Low-level input voltage
IIN Input current
CI Input capacitance
Digital Outputs(7)
BVDD = 3.6V
BVDD = 2.7V
VI = BVDD or GND
2 BVDD+0.3 V
−0.3 0.8 V
±50 nA
5 pF
Logic family
LVCMOS
VOH
VOL
CO
CL
High-level output voltage
Low-level output voltage
Output capacitance
Load capacitance
Data format
BVDD = 2.7V, IOH = −100µA
BVDD = 2.7V, IOL = +100µA
BVDD−0.2
5
Bit Stream
V
0.2 V
pF
30 pF
Power Supply
AVDD
BVDD
Analog supply voltage
Buffer I/O supply voltage
Low-voltage levels
5V logic levels
4.5 5.5 V
2.7 3.6 V
4.5 5.5 V
AIDD
Analog operating supply current
CLKSEL = 1
CLKSEL = 0
11.8 16 mA
11.4 15.5 mA
BIDD
Buffer I/O operating supply current
Power dissipation
BVDD = 3V, CLKOUT = 10MHz
BVDD = 5V, CLKOUT = 10MHz
CLKSEL = 0
CLKSEL = 1
2 mA
2 mA
57 77.5 mW
59 80 mW
(1) All typical values are at TA = +25°C.
(2) Integral nonlinearity is defined as the maximum deviation of the line through the end points of the specified input range of the transfer curve
for CH x+ = −2V to +2V at 2.5V, expressed either as the number of LSBs or as a percent of measured input range (4V).
(3) Ensured by design.
(4) Maximum values, including temperature drift, are ensured over the full specified temperature range.
(5) With reduced accuracy, the clock frequency can go from 1MHz to 33MHz.
(6) Applicable for 5.0V nominal supply: BVDD (min) = 4.5V and BVDD (max) = 5.5V.
(7) Applicable for 3.0V nominal supply: BVDD (min) = 2.7V and BVDD (max) = 3.6V.
EQUIVALENT INPUT CIRCUIT
AVDD
RON
650Ω
AIN
C(SAMPLE)
1pF
Diode Turn−On Voltage: 0.35V
AGND
Equivalent Analog Input Circuit
BVDD
DIN
BGND
Equivalent Digital Input Circuit
5
5 Page 
ADS1205
www.ti.com
SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
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.
FREQUENCY SPECTRUM
(4096 point FFT fIN = 1kHz, 4VPP)
0
−20
−40
−60
−80
−100
−120
−140
−160
0 2 4 6 8 10 12 14 16 18 19
Frequency (kHz)
Figure 20
16
14
12
10
8
6
4
2
10
EFFECTIVE NUMBER OF BITS
vs DECIMATION RATIO
Sinc3 Filter
Sinc2 Filter
98
86
74
62
50
38
26
100
Decimation Ratio (OSR)
Figure 22
14
1k
COMMON−MODE REJECTION RATIO
vs FREQUENCY
130
FREQUENCY SPECTRUM
(4096 point FFT fIN = 5kHz, 4VPP)
0
−20
−40
−60
−80
−100
−120
−140
−160
0 2 4 6 8 10 12 14 16 18 19
Frequency (kHz)
Figure 21
POWER−SUPPLY CURRENT
vs TEMPERATURE
16
15
14
CLKSEL = 0, CLKIN = 32MHz
13
12
11
10
CLKSEL = 1
9
CLKSEL = 0, CLKIN = 20MHz
8
−40 −20
0 20 40
Temperature (_C)
Figure 23
60
80 100
POWER−SUPPLY REJECTION RATIO
vs FREQUENCY
100
120 90
110 80
100 70
90
100
1k 10k 100k
Input Frequency (kHz)
Figure 24
1M
60
100
1k
Frequency of Power Supply (kHz)
Figure 25
10k
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ADS1205.PDF ] | |
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