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PDF ADS8422 Data sheet ( Hoja de datos )
| Número de pieza | ADS8422 | |
| Descripción | MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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BurrĆBrown Products
from Texas Instruments
ADS8422
SLAS512B – JUNE 2006 – REVISED DECEMBER 2006
16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER
SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE,
REFERENCE
FEATURES
• Fully Differential Input with Pseudo-Bipolar
Input Range -4 V to +4 V
• 16-Bit NMC at 4 MSPS
• 1 LSB INL Typ
• 92dB SNR, -102dB THD Typ with 100-kHz
Input
• Internal 4.096-V Reference and Reference
Buffer
• REFIN/2 Available for Setting Analog Input
Common-Mode Voltage
• Zero Latency
• High-Speed Parallel Interface
• Single Supply Operation Capability
• Low Power: 155 mW at 4 MHz Typ, Flexible
Power-Down Scheme
• Pin-Out Similar to ADS8412/8402
• 48-Pin 9×9 TQFP Package
APPLICATIONS
• DWDM
• Instrumentation
• High-Speed, High-Resolution, Zero Latency
Data Acquisition Systems
• Transducer Interface
• Medical Instruments
• Spectrum Analysis
• ATE
DESCRIPTION
The ADS8422 is a 16-bit, 4-MHz A/D converter with
an internal 4.096-V reference. The device includes a
16-bit capacitor-based multi-bit SAR A/D converter
with inherent sample and hold. This converter
includes a full 16-bit interface and an 8-bit option
where data is read using two 8-bit read cycles if
necessary.
The ADS8422 has a fully differential, pseudo-bipolar
input. It is available in a 48-lead TQFP package and
is characterized over the industrial -40°C to +85°C
temperature range.
TYPE/SPEED
18-Bit Pseudo-Diff
18-Bit Pseudo-Bipolar, Fully Diff
16-Bit Pseudo-Diff
16-Bit Pseudo-Bipolar, Fully Diff
14-Bit Pseudo-Diff
12-Bit Pseudo-Diff
(1) S: Serial
HIGH-SPEED SAR CONVERTER FAMILY(1)
500 kHz
ADS8383
ADS8327/28 (s)
~600 kHz
ADS8381
ADS8380 (s)
ADS8382 (s)
ADS8370 (s)
ADS8372 (s)
750 kHz
1 MHz
ADS8481
1.25 MHz
ADS8371
ADS8482
ADS8471
ADS8329/30 (s)
ADS8472
ADS7886
ADS8401
ADS8405
ADS8402
ADS8406
ADS7890 (s)
2 MHz
ADS8411
ADS8410 (s)
ADS8412
ADS8413 (s)
ADS7883
3 MHz
ADS7891
4MHz
ADS8422
ADS7881
TEMPOUT
+IN
−IN
COMMOUT
REFIN
REFOUT
Temp Sensor
SAR
CDAC
Comparator
½
Clock
4.096-V
Internal Reference
Output
Latches
and
3-State
Drivers
Conversion
and
Control Logic
BYTE
16-/8-Bit
Parallel Data
Output Bus
PD2
RESET/PD1
CONVST
BUSY
CS
RD
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated
1 page  
ADS8422
www.ti.com
SLAS512B – JUNE 2006 – REVISED DECEMBER 2006
SPECIFICATIONS (Continued)
TA = –40°C to 85°C, +VA = 5 V, +VAREG = 5 V to 3 V, +VBD = 5 V to 2.7 V, fSAMPLE = 4 MSPS, Vref = 4.096 V (measured
with internal reference buffer) (unless otherwise noted)
PARAMETER
DIGITAL INPUT/OUTPUT
Logic family – CMOS
Logic level
Data format – Twos complement
VIH
VIL
VOH
VOL
POWER SUPPLY REQUIREMENTS
+VA
Power supply voltage
+VAREG
+VBD
+VA
Supply current
+VAREG
+VBD (1)
POWER DOWN(2)
Supply current
Power
Power-up time
Supply current
Power
Power-up time
TEMPERATURE RANGE
Operating free-air
+VA
+VAREG
+VA
+VAREG
TEST CONDITIONS
MIN TYP
MAX UNIT
IIH = 5 µA
IIL = 5 µA
IOH = 2 TTL loads
IOL = 2 TTL loads
0.75×(+VBD)
–0.3
+VBD – 0.6
+VBD + 0.3
0.8
0.4
V
+VA = 5 V, PD1 = 1, PD2 = 1
+VAREG = 5 V, PD1 = 1, PD2 = 1
+VAREG = 3 V, PD1 = 1, PD2 = 1
+VBD = 3 V, 10 pF/pin
+VBD = 5 V, 20 pF/pin
PD1 = 0, PD2 = 1, +VA = 5 V
(PD1, PD2) : (0,1) → (1,1)
PD1 = 0, PD2 = 0
(PD1, PD2) : (0,0) → (1,1) , 1-µF Storage
capacitor from REFOUT to AGND
4.75
2.85
2.7
5
3.0
3.0
24
12
12
0.55
1.8
2.5
5
5
5
40
–40
5.25
5.25
5.25
27
14
14
V
mA
mA
mA
3.4 mA
µA
17 mW
5 µs
µA
µW
25 ms
85 °C
(1) This includes the current required for charging the external load capacitance on the digital outputs and is measured with four digital
outputs toggling at the same time.
(2) (PD1 , PD2 ) = (1,0) is reserved. Do not use this power-down pins combination.
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5
5 Page 
www.ti.com
ADS8422
SLAS512B – JUNE 2006 – REVISED DECEMBER 2006
TYPICAL CHARACTERISTICS (continued)
INL
2
1.5 +VA = 5 V, +VAREG = 3 V, +VBD = 3 V, REFIN = 4.096 V
1
0.5
0
-0.5
-1
-1.5
-2
0
16384
32768
Code
Figure 20.
49152
65536
FFT (10 kHz)
0
+VA = 5 V, +VAREG = 3 V, +VBD = 3 V, REFIN = 4.096 V,
-40 fi = 10 kHz, SNR = 93 dB, THD = 114 dB
-80
-120
-160
-200
0
0
-40
-80
-120
-160
-200
0
200 400 600 800 1000 1200 1400 1600 1800 2000
f - Frequency - kHz
Figure 21.
FFT (100 kHz)
+VA = 5 V, +VAREG = 3 V, +VBD = 3 V, REFIN = 4.096 V,
fi = 100 kHz, SNR = 92 dB, THD = 102 dB
200 400 600 800 1000 1200 1400 1600 1800 2000
f - Frequency - kHz
Figure 22.
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11
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ADS8422.PDF ] | |
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