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Burr-Brown Corporation

ADS7806 Datasheet Preview

ADS7806 Datasheet

Low-Power 12-Bit Sampling CMOS ANALOG-to-DIGITAL CONVERTER

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® ADS7806
Low-Power 12-Bit Sampling CMOS
ANALOG-to-DIGITAL CONVERTER
FEATURES
q 35mW max POWER DISSIPATION
q 50µW POWER DOWN MODE
q 25µs max ACQUISITION AND
CONVERSION
q ±1/2LSB max INL AND DNL
q 72dB min SINAD WITH 1kHz INPUT
q ±10V, 0V TO +5V, AND 0V TO +4V INPUT
RANGES
q SINGLE +5V SUPPLY OPERATION
q PARALLEL AND SERIAL DATA OUTPUT
q PIN-COMPATIBLE WITH 16-BIT ADS7807
q USES INTERNAL OR EXTERNAL
REFERENCE
q 28-PIN 0.3" PLASTIC DIP AND SOIC
DESCRIPTION
The ADS7806 is a low-power 12-bit sampling analog-
to-digital using state-of-the-art CMOS structures. It
contains a complete 12-bit, capacitor-based, SAR A/D
with S/H, clock, reference, and microprocessor inter-
face with parallel and serial output drivers.
The ADS7806 can acquire and convert to full 12-bit
accuracy in 25µs max while consuming only 35mW
max. Laser-trimmed scaling resistors provide standard
industrial input ranges of ±10V and 0V to +5V. In
addition, a 0V to +4V range allows development of
complete single supply systems.
The 28-pin ADS7806 is available in a plastic 0.3" DIP
and in an SOIC, both fully specified for operation over
the industrial –40°C to +85°C temperature range.
R1IN
40k
R2IN
20k
10k
CAP
40k
REF
Clock
Successive Approximation Register and Control Logic
R/C
CS
BYTE
Power
Down
CDAC
Comparator
Buffer
6k
Internal
+2.5V Ref
Reference
Power
Down
Parallel
and
Serial
Data
Out
BUSY
Serial Data
Clock
Serial Data
Parallel Data
8
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1992 Burr-Brown Corporation
PDS-1158C
Printed in U.S.A. November, 1994




Burr-Brown Corporation

ADS7806 Datasheet Preview

ADS7806 Datasheet

Low-Power 12-Bit Sampling CMOS ANALOG-to-DIGITAL CONVERTER

No Preview Available !

SPECIFICATIONS
ELECTRICAL
At TA = –40°C to +85°C, fS = 40kHz, VDIG = VANA = +5V, using internal reference and fixed resistors shown in Figure 7b, unless otherwise specified.
ADS7806P, U
ADS7806PB, UB
PARAMETER
RESOLUTION
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
12 *
ANALOG INPUT
Voltage Ranges
Impedance
Capacitance
±10, 0 to +5, 0 to +4
(See Table II)
35
*
THROUGHPUT SPEED
Conversion Time
Complete Cycle
Throughput Rate
DC ACCURACY
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Transition Noise(2)
Gain Error
Full Scale Error(3,4)
Full Scale Error Drift
Full Scale Error(3,4)
Full Scale Error Drift
Bipolar Zero Error(3)
Bipolar Zero Error Drift
Unipolar Zero Error(3)
Unipolar Zero Error Drift
Recovery Time to Rated Accuracy
from Power Down(5)
Power Supply Sensitivity
(VDIG = VANA = VS)
AC ACCURACY
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise+Distortion)
Signal-to-Noise
Usable Bandwidth(7)
Full Power Bandwidth (-3dB)
Acquire and Convert
Ext. 2.5000V Ref
Ext. 2.5000V Ref
±10V Range
±10V Range
0V to 5V, 0V to 4V Ranges
0V to 5V, 0V to 4V Ranges
2.2µF Capacitor to CAP
+4.75V < VS < +5.25V
fIN = 1kHz, ±10V
fIN = 1kHz, ±10V
fIN = 1kHz, ±10V
fIN = 1kHz, ±10V
20
25
40 *
*
*
±0.15
±0.15
Guaranteed
0.1
±0.2
±7
±0.5
±0.5
±0.5
1
±0.9
±0.9
±0.5
±0.5
±10
±3
±0.5
* ±0.45
* ±0.45
*
*
±0.1
±0.25
±5
±0.25
*
*
*
*
*
*
*
80 90
*
–90 –80
70 73
72
70 73
72
130
600
*
*
*
*
*
*
*
SAMPLING DYNAMICS
Aperture Delay
Aperture Jitter
Transient Response
Overvoltage Recovery(8)
FS Step
40
20
5
750
*
*
*
*
REFERENCE
Internal Reference Voltage
Internal Reference Source Current
(Must use external buffer.)
Internal Reference Drift
External Reference Voltage Range
for Specified Linearity
External Reference Current Drain
No Load
Ext. 2.5000V Ref
2.48 2.5 2.52
*
*
*
1*
8*
2.3 2.5 2.7
*
*
*
100 *
DIGITAL INPUTS
Logic Levels
VIL
VIH
IIL
IIH
DIGITAL OUTPUTS
Data Format
Data Coding
VOL
VOH
Leakage Current
Output Capacitance
VIL = 0V
VIH = 5V
ISINK = 1.6mA
ISOURCE = 500µA
High-Z State,
VOUT = 0V to VDIG
High-Z State
–0.3
+2.0
+0.8
VD +0.3V
±10
±10
*
*
Parallel 12-bits in 2-bytes; Serial
Binary Two’s Complement or Straight Binary
+0.4
+4 *
±5
15
*
*
*
*
*
*
*
UNITS
Bits
V
pF
µs
µs
kHz
LSB(1)
LSB
Bits
LSB
%
%
ppm/°C
%
ppm/°C
mV
ppm/°C
mV
ppm/°C
ms
LSB
dB(6)
dB
dB
dB
kHz
kHz
ns
ps
µs
ns
V
µA
ppm/°C
V
µA
V
V
µA
µA
V
V
µA
pF
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
ADS7806
2


Part Number ADS7806
Description Low-Power 12-Bit Sampling CMOS ANALOG-to-DIGITAL CONVERTER
Maker Burr-Brown Corporation
Total Page 18 Pages
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