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PDF AD7329 Data sheet ( Hoja de datos )
| Número de pieza | AD7329 | |
| Descripción | 12-Bit Plus Sign ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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1 MSPS, 8-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7329
FEATURES
12-bit plus sign SAR ADC
True bipolar input ranges
Software-selectable input ranges
±10 V, ±5 V, ±2.5 V, 0 V to +10 V
1 MSPS throughput rate
Eight analog input channels with channel sequencer
Single-ended true differential and pseudo differential
analog input capability
High analog input impedance
MUXOUT and ADCIN pins allow separate access to mux and ADC
Low power: 21 mW
Temperature indicator
Full power signal bandwidth: 20 MHz
Internal 2.5 V reference
High speed serial interface
iCMOS™ process technology
24-lead TSSOP package
Power-down modes
GENERAL DESCRIPTION
The AD73291 is an 8-channel, 12-bit plus sign successive
approximation ADC designed on the iCMOS (industrial
CMOS) process. iCMOS is a process combining high voltage
CMOS and low voltage CMOS. It enables the development of
a wide range of high performance analog ICs capable of 33 V
operation in a footprint that no previous generation of high
voltage parts could achieve. Unlike analog ICs using conventional
CMOS processes, iCMOS components can accept bipolar input
signals while providing increased performance, dramatically
reduced power consumption, and reduced package size.
The AD7329 can accept true bipolar analog input signals. The
AD7329 has four software-selectable input ranges, ±10 V, ±5 V,
±2.5 V, and 0 V to +10 V. Each analog input channel can be
independently programmed to one of the four input ranges.
The analog input channels on the AD7329 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7329 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/REFOUT pin, the AD7329 can accept a true
bipolar ±12 V analog input. The ADC has a high speed serial
interface that can operate at throughput rates up to 1 MSPS.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
MUXOUT+ MUXOUT– ADCIN– ADCIN+ VDD
REFIN/REFOUT VCC
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
I/P
MUX
CHANNEL
SEQUENCER
AD7329
2.5V
VREF
13-BIT SUCCESSIVE
T/H APPROXIMATION
ADC
VSS
Figure 1.
CONTROL
LOGIC AND
REGISTERS
AGND
VDRIVE
DOUT
SCLK
CS
DIN
PRODUCT HIGHLIGHTS
1. The AD7329 can accept true bipolar analog input signals,
±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
2. The eight analog inputs can be configured as eight single-
ended inputs, four true differential input pairs, four pseudo
differential inputs, or seven pseudo differential inputs.
3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4. Low power, 21 mW, at 1 MSPS.
5. MUXOUT and ADCIN pins allow for signal conditioning of
the mux output prior to entering the ADC.
Table 1. Similar Devices
Device
Number Throughput Rate
AD7328 1000 kSPS
AD7327 500 kSPS
AD7324 1000 kSPS
AD7323 500 kSPS
AD7322 1000 kSPS
AD7321 500 kSPS
Number of Channels
8
8
4
4
2
2
1 Protected by U.S. Patent No. 6,731,232.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
1 page  
Parameter1
ANALOG INPUT
Input Voltage Ranges
(Programmed via Range
Register)
Pseudo Differential VIN−
Input Range
DC Leakage Current
Input Capacitance3
ADCIN± Capacitance3
MUXOUT− Capacitance3
MUXOUT+ Capacitance3
REFERENCE INPUT/OUTPUT
Input Voltage Range
Input DC Leakage Current
Input Capacitance
Reference Output Voltage
Reference Output Voltage Error
@ 25°C
Reference Output Voltage
TMIN to TMAX
Reference Temperature
Coefficient
Reference Output Impedance
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN3
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
Floating-State Leakage Current
Floating-State Output
Capacitance3
Output Coding
B Version
Min Typ Max
±10
±5
±2.5
0 to 10
±3.5
±6
±5
+3/−5
3
16
7
10
14.5
10.5
4.0
7.5
13
±100
2.5 3
±1
10
2.5
±5
±10
25
3
7
2.4
10
0.8
0.4
±1
VDRIVE −
0.2 V
5
0.4
±1
Straight natural binary
Twos complement
AD7329
Unit Test Conditions/Comments
Reference = 2.5 V; see Table 6
V VDD = 10 V min, VSS = −10 V min, VCC = 2.7 V to 5.25 V
V VDD = 5 V min, VSS = −5 V min, VCC = 2.7 V to 5.25 V
V VDD = 5 V min, VSS = − 5 V min, VCC = 2.7 V to 5.25 V
V VDD = 10 V min, VSS = AGND min, VCC = 2.7 V to 5.25 V
VDD = 16.5 V, VSS = −16.5 V, VCC = 5 V; see Figure 43 and
Figure 44
V Reference = 2.5 V; range = ±10 V
V Reference = 2.5 V; range = ±5 V
V Reference = 2.5 V; range = ±2.5 V
V Reference = 2.5 V; range = 0 V to +10 V
nA VIN = VDD or VSS
nA Per channel, VIN = VDD or VSS
pF When in track, all ranges, single ended
pF When in track, ±10 V range, single ended
pF When in track, ±5 V range, single ended
pF When in track, ±2.5 V range, single ended
pF When in track, 0 V to +10 V range, single ended
pF When in hold, all ranges, single ended
pF All ranges, single ended
pF All ranges, single ended
V
μA
pF
V
mV
mV
ppm/°C
ppm/°C
Ω
V
V VCC = 4.75 V to 5.25 V
V VCC = 2.7 to 3.6 V
μA VIN = 0 V or VDRIVE
pF
V ISOURCE = 200 μA
V ISINK = 200 μA
μA
pF
Coding bit set to 1 in control register
Coding bit set to 0 in control register
Rev. 0 | Page 5 of 40
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
0
4096 POINT FFT
VCC = VDRIVE = 5V
–20 VDD = 15V, VSS = –15V
TA = 25°C
INT/EXT 2.5V REFERENCE
–40 ±10V RANGE
fIN = 50kHz
SNR = 77.30dB
–60 SINAD = 76.85dB
THD = –86.96dB
SFDR = –88.22dB
–80
–100
–120
–140
0
50 100 150 200 250 300 350 400 450 500
FREQUENCY (kHz)
Figure 4. FFT True Differential Mode
0
4096 POINT FFT
VCC = VDRIVE = 5V
–20 VDD = 15V, VSS = –15V
TA = 25°C
INT/EXT 2.5V REFERENCE
–40 ±10V RANGE
fIN = 50kHz
SNR = 74.67dB
–60 SINAD = 74.03dB
THD = –82.68dB
SFDR = –85.40dB
–80
–100
–120
–140
0
50 100 150 200 250 300 350 400 450 500
FREQUENCY (kHz)
Figure 5. FFT Single-Ended Mode
AD7329
1.0
VCC = VDRIVE = 5V
INT/EXT 2.5V REFERENCE
0.8 TA = 25°C
±10V RANGE
VDD = 15V, VSS = –15V +INL = +0.55LSB
0.6 –INL = –0.68LSB
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0 0
1024 2048 3072 4096 5120 6144 7168 8192
512 1536 2560 3584 4608 5632 6656 7680
CODE
Figure 7. Typical INL True Differential Mode
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6 VCC = VDRIVE = 5V
±10V RANGE
TA = 25°C
+DNL = +0.79LSB
–0.8 VDD = 15V, VSS = –15V
–DNL = –0.38LSB
INT/EXT 2.5V REFERENCE
–1.0 0
1024 2048 3072 4096 5120 6144 7168 8192
512 1536 2560 3584 4608 5632 6656 7680
CODE
Figure 8. Typical DNL Single-Ended Mode
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
VCC = VDRIVE = 5V
TA = 25°C
VDD = 15V, VSS = –15V
INT/EXT 2.5V REFERENCE
±10V RANGE
–0.8
+DNL = +0.72LSB
–DNL = –0.22LSB
–1.0
0
1024 2048 3072 4096 5120 6144 7168 8192
512 1536 2560 3584 4608 5632 6656 7680
CODE
Figure 6. Typical DNL True Differential Mode
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
VCC = VDRIVE = 5V
TA = 25°C
VDD = 15V, VSS = –15V
INT/EXT 2.5V REFERENCE
–0.8
±10V RANGE
+INL = +0.87LSB
–1.0 0
–INL = –0.49LSB
1024 2048 3072 4096 5120 6144 7168 8192
512 1536 2560 3584 4608 5632 6656 7680
CODE
Figure 9. Typical INL Single-Ended Mode
Rev. 0 | Page 11 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD7329.PDF ] | |
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