16-Bit 4MSPS Fully Differential Pseudo Bipolar Input Micro Power Sampling ADC
Burr Brown Products
from Texas Instruments
PRODUCT PREVIEW
FEATURES
APPLICATIONS
DESCRIPTION
CDAC
Output
Latches
and
3-State
Drivers
BYTE
16-/8-Bit
Parallel Data
Output Bus
SAR
Conversion
and
Control Logic
Comparator
Clock
+IN
-IN
REFIN
CONVST
BUSY
CS
RD
4.096-V
Internal Reference
REFOUT
RESET/PD1
PD2
COMMOUT
Temp Sensor
TEMPOUT
ADS8422
SLAS512 JUNE 2006
16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER
SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE,
REFERENCE
DWDM
Fully Differential Input with Pseudo-Bipolar
Input Range -4 V to +4 V
Instrumentation
High-Speed, High-Resolution, Zero Latency
16-Bit NMC at 4 MSPS
Data Acquisition Systems
1 LSB INL Typ
Transducer Interface
92dB SNR, -102dB THD Typ with 100-kHz
Medical Instruments
Input
Spectrum Analysis
Internal 4.096-V Reference and Reference
ATE
Buffer
REFIN/2 Available for Setting Analog Input
Common-Mode Voltage
The ADS8422 is a 16-bit, 4-MHz A/D converter with
Zero Latency
an internal 4.096-V reference. The device includes a
High-Speed Parallel Interface
16-bit capacitor-based multi-bit SAR A/D converter
Single Supply Operation Capability
with inherent sample and hold. This converter
includes a full 16-bit interface and an 8-bit option
Low Power: 160 mW at 4 MHz Typ, Flexible
where data is read using two 8-bit read cycles if
Power-Down Scheme
necessary.
Pin-Out Similar to ADS8412/8402
The ADS8422 has a fully differential, pseudo-bipolar
48-Pin 9
9 TQFP Package
input. It is available in a 48-lead TQFP package and
is characterized over the industrial -40
C to +85
C
temperature range.
HIGH-SPEED SAR CONVERTER FAMILY
TYPE/SPEED
500 kHz
~600 kHz
750 kHz
1 MHz
1.25 MHz
2 MHz
3 MHz
4MHz
ADS8383
ADS8381
ADS8481
18-Bit Pseudo-Diff
ADS8380 (s)
18-Bit Pseudo-Bipolar, Fully Diff
ADS8382 (s)
ADS8422
ADS8327
ADS8370 (s)
ADS8371
ADS8471
ADS8401
ADS8411
16-Bit Pseudo-Diff
ADS8328
ADS8372 (s)
ADS8405
ADS8410 (s)
ADS8472
ADS8402
ADS8412
ADS8422
16-Bit Pseudo-Bipolar, Fully Diff
ADS8406
ADS8413 (s)
14-Bit Pseudo-Diff
ADS7890 (s)
ADS7891
12-Bit Pseudo-Diff
ADS7886
ADS7883
ADS7881
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.
PRODUCT PREVIEW information concerns products in the
Copyright 2006, Texas Instruments Incorporated
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
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PRODUCT PREVIEW
ABSOLUTE MAXIMUM RATINGS
(1)
ADS8422
SLAS512 JUNE 2006
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
(1)
MAXIMUM
MAXIMUM
INTEGRAL
NO MISSING CODES
PACKAGE
PACKAGE
TEMPERATURE
ORDERING
TRANSPORT
MODEL
DIFFERENTIAL
LINEARITY
RESOLUTION (BIT)
TYPE
DESIGNATOR
RANGE
INFORMATION
MEDIA QTY.
LINEARITY (LSB)
(LSB)
Small tape and
ADS8422IPFBT
reel 250
9
9 48-Pin
ADS8422I
6
2
15
PFB
40
C to 85
C
TQFP
Tape and reel
ADS8422IPFBR
1000
Small tape and
ADS8422IBPFBT
reel 250
9
9 48-Pin
ADS8422IB
2
+1.5/-1
16
PFB
40
C to 85
C
TQFP
Tape and reel
ADS8422IBPFBR
1000
(1)
For the most current specifications and package information, refer to our website at
www.ti.com
.
over operating free-air temperature range (unless otherwise noted)
VALUE
UNIT
+IN to AGND
0.4 to +VA + 0.1
V
IN to AGND
0.4 to +VA + 0.1
V
Voltage
+VA to AGND
0.3 to 7
V
+VBD to BDGND
0.3 to 7
V
+VA to +VBD
0.3 to 2.55
V
Digital input voltage to BDGND
0.3 to +VBD + 0.3
V
Digital output voltage to BDGND
0.3 to +VBD + 0.3
V
T
A
Operating free-air temperature range
40 to 85
C
T
stg
Storage temperature range
65 to 150
C
Junction temperature (T
J
max)
150
C
Power dissipation
(T
J
Max T
A
)/
JA
TQFP 48-pin package
JA
thermal impedance
86
C/W
Vapor phase (60 sec)
215
C
Lead temperature, soldering
Infrared (15 sec)
220
C
(1)
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2
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PRODUCT PREVIEW
SPECIFICATIONS
ADS8422
SLAS512 JUNE 2006
T
A
= 40
C to 85
C, +VA = 5 V, +VAREG = 5 V to 3 V, +VBD = 5 V to 2.7 V, f
SAMPLE
= 4 MSPS, V
ref
= 4.096 V (measured
with internal reference and reference buffer) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUT
Full-scale input voltage
(1)
+IN (IN)
V
ref
V
ref
V
+IN
0.2
V
ref
+ 0.2
Absolute input voltage
V
IN
0.2
V
ref
+ 0.2
Common-mode input range
(V
ref
)/2 0.2
(V
ref
)/2
(V
ref
)/2 + 0.2
V
Input capacitance
30
pF
Input leakage current
1
nA
SYSTEM PERFORMANCE
Resolution
16
Bits
ADS8422I
15
No missing codes
Bits
ADS8422IB
16
ADS8422I
6
2
6
LSB
Integral linearity
(2) (3)
(16 bit)
(2)
ADS8422IB
2
1
2
ADS8422I
2
0.7
2
LSB
Differential linearity
(16 bit)
ADS8422IB
1
0.7
1.5
ADS8422I
0.5
0.25
0.5
Offset error
mV
ADS8422IB
0.5
0.25
0.5
ADS8422I
V
ref
= 4.096 V
0.1
0.05
0.1
Gain error
(4) (5)
%FS
ADS8422IB
V
ref
= 4.096 V
0.1
0.05
0.1
At dc
78
Common-mode rejection ratio
dB
[+IN + (IN)]/2 = 50 mV
pp
at 4 MHz,
78
[+IN (IN)] = 1 V
pp
at 1 MHz
Noise
At 0000h output code
40
V RMS
Power supply rejection ratio
At 8000h output code
78
dB
SAMPLING DYNAMICS
Conversion time
0.180
s
Acquisition time
0.070
s
Throughput rate
4
MHz
Aperture delay
3
ns
Aperture jitter
7
ps RMS
Step response
70
ns
Overvoltage recovery
140
ns
(1)
Ideal input span, does not include gain or offset error.
(2)
LSB means least significant bit and is equal to 2V
REF
/65536.
(3)
This is endpoint INL, not best fit.
(4)
Measured relative to an ideal full-scale input [+IN (IN)] of 8.192 V.
(5)
This specification does not include the internal reference voltage error and drift.
3
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PRODUCT PREVIEW
SPECIFICATIONS (Continued)
ADS8422
SLAS512 JUNE 2006
T
A
= 40
C to 85
C, +VA = 5 V, +VAREG = 5.25 V to 3 V, +VBD = 5 V to 2.7 V, f
SAMPLE
= 4 MSPS, V
ref
= 4.096 V (measured
with internal reference and reference buffer) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DYNAMIC CHARACTERISTICS
ADS8422I
104
V
IN
= 8 V
pp
at 20 kHz
ADS8422IB
104
Total harmonic distortion (THD)
(1)
dB
ADS8422I
102
V
IN
= 8 V
pp
at 100 kHz
ADS8422IB
102
ADS8422I
92.5
V
IN
= 8 V
pp
at 20 kHz
ADS8422IB
92.5
Signal to noise ratio (SNR)
dB
ADS8422I
92
V
IN
= 8 V
pp
at 100 kHz
ADS8422IB
92
ADS8422I
92.5
V
IN
= 8 V
pp
at 20 kHz
ADS8422IB
92.5
Signal to noise + distortion (SINAD)
dB
ADS8422I
92
V
IN
= 8 V
pp
at 100 kHz
ADS8422IB
92
ADS8422I
V
IN
= 8 V
pp
at 20 kHz
ADS8422IB
Spurious free dynamic range (SFDR)
dB
ADS8422I
V
IN
= 8 V
pp
at 100 kHz
ADS8422IB
3dB Small signal bandwidth
30
MHz
VOLTAGE REFERENCE INPUT
Reference voltage at REFIN, V
ref
3.9
4.096
4.15
V
Reference resistance
1000
M
INTERNAL REFERENCE OUTPUT
From 95% (+V5A), with 1-
F capacitor on
Internal reference start-up time
25
ms
REFOUT
Reference voltage range, V
ref
I
O
= 0, T
A
= 25
C
4.088
4.096
4.104
V
Source current
Static load
10
A
Line regulation
+VA = 4.75 V to 5.25 V
1
mV
Drift
I
O
= 0
16
PPM/
C
V
REF
/2 -
V
REF
/2
V
REF
/2 +
ANALOG COMMON-MODE, PIN 3
V
0.016
0.016
(1)
Calculated on the first nine harmonics of the input frequency.
4
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PRODUCT PREVIEW
SPECIFICATIONS
ADS8422
SLAS512 JUNE 2006
T
A
= 40
C to 85
C, +VA = 5 V, +VAREG = 5 V to 3 V, +VBD = 5 V to 2.7 V, f
SAMPLE
= 4 MSPS, V
ref
= 4.096 V (measured
with internal reference and reference buffer) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DIGITAL INPUT/OUTPUT
Logic family CMOS
V
IH
I
IH
= 5
A
2.0
+VBD + 0.3
V
IL
I
IL
= 5
A
0.3
0.8
Logic level
V
V
OH
I
OH
= 2 TTL loads
+VBD 0.6
V
OL
I
OL
= 2 TTL loads
0.4
Data format Twos Complement
POWER SUPPLY REQUIREMENTS
+VA
4.75
5
5.25
Power supply voltage
+VAREG
2.85
3.0
5.2
V
+VBD
2.7
3.0
5.25
+VA
+VA = 5 V
25
27
mA
Supply current
+VAREG = 5 V
12
14
+VAREG
mA
+VAREG = 3 V
11
13
POWER DOWN
PD1 = 0
2.5
mA
Supply current +VA, power down
PD1 = PD2 = 0
A
1-
F Storage capacitor from REFOUT to
Power-up time, from after +VA = 4.75 V
25
ms
AGND
TEMPERATURE RANGE
Operating free-air
40
85
C
5
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