Burr Brown Corporation ADS7862YB-2K5, ADS7862YB-250, ADS7862Y-2K5, ADS7862 Datasheet
1
ADS7862
®
Dual 500kHz, 12-Bit, 2 + 2 Channel
Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
● 4 INPUT CHANNELS
● FULLY DIFFERENTIAL INPUTS
● 2µs TOTAL THROUGHPUT PER CHANNEL
● GUARANTEED NO MISSING CODES
● PARALLEL INTERFACE
● 1MHz EFFECTIVE SAMPLING RATE
● LOW POWER: 40mW
APPLICATIONS
● MOTOR CONTROL
● MULTI-AXIS POSITIONING SYSTEMS
● 3-PHASE POWER CONTROL
DESCRIPTION
The ADS7862 is a dual 12-bit, 500kHz analog-todigital converter (A/D) with 4 fully differential input
channels grouped into two pairs for high speed simultaneous signal acquisition. Inputs to the sample-and-hold
amplifiers are fully differential and are maintained differential to the input of the A/D converter. This provides
excellent common-mode rejection of 80dB at 50kHz
which is important in high noise environments.
The ADS7862 offers parallel interface and control inputs to minimize software overhead. The output data for
each channel is available as a 12-bit word. The ADS7862
is offered in an TQFP-32 package and is full specified
over the –40°C to +85°C operating range.
®
ADS7862
© 1998 Burr-Brown Corporation PDS-1475B Printed in U.S.A. May, 2000
SAR
Interface
Conversion
and
Control
Output
Registers
COMP
CONVST
BUSY
RD
CS
Data Output
12
CLOCK
A0
CDAC
Internal
2.5V
Reference
S/H
Amp
S/H
Amp
CH A0–
CH A0+
REF
IN
CH A1–
CH A1+
SAR
COMP
CDAC
MUX
MUX
CH B0–
CH B0+
CH B1–
CH B1+
REF
OUT
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 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
ADS7862
¤
For most current data sheet and other product
information, visit www.burr-brown.com
2
ADS7862
®
SPECIFICATIONS
All specifications T
MIN
to T
MAX
, +VA = +VD = +5V, V
REF
= internal +2.5V and f
CLK
= 8MHz, f
SAMPLE
= 500kHz, unless otherwise noted.
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.
ADS7862Y ADS7862YB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 ✻ Bits
ANALOG INPUT
Input Voltage Range-Bipolar V
CENTER
= Internal V
REF
at 2.5V –V
REF
+V
REF
✻✻V
Absolute Input Range +IN –0.3 V
CC
+ 0.3 V
–IN –0.3 V
CC
+ 0.3 V
Input Capacitance 15 ✻ pF
Input Leakage Current CLK = GND ±1 ✻ µA
SYSTEM PERFORMANCE
No Missing Codes 12 ✻ Bits
Integral Linearity ±0.75 ±2 ±0.5 ±1 LSB
Integral Linearity Match 0.5 1 ✻✻ LSB
Differential Linearity ±0.75 ±0.5 ±1 LSB
Bipolar Offset Error Referenced to REF
IN
±0.75 ±3 ±0.5 ±2 LSB
Bipolar Offset Error Match 3 2 LSB
Positive Gain Error Referenced to REF
IN
±0.15 ±0.75 ±0.1 ±0.5 % of FSR
Positive Gain Error Match 2 1 LSB
Negative Gain Error Referenced to REF
IN
±0.15 ±0.75 ±0.1 ±0.5 % of FSR
Negative Gain Error Match 2 1 LSB
Common-Mode Rejection Ratio At DC 80 ✻ dB
V
IN
= ±1.25Vp-p at 50kHz 80 ✻ dB
Noise 120 ✻ µVrms
Power Supply Rejection Ratio ±0.5 ±2 ✻✻ LSB
SAMPLING DYNAMICS
Conversion Time per A/D 1.75 ✻ µs
Acquisition Time 0.25 ✻ µs
Throughput Rate 500 ✻ kHz
Aperture Delay 3.5 ✻ ns
Aperture Delay Matching 100 ✻ ps
Aperture Jitter 50 ✻ ps
Small-Signal Bandwidth 40 ✻ MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion V
IN
= ±2.5Vp-p at 100kHz 75 ✻ dB
SINAD V
IN
= ±2.5Vp-p at 100kHz 71 ✻ dB
Spurious Free Dynamic Range V
IN
= ±2.5Vp-p at 100kHz –78 ✻ dB
Channel-to-Channel Isolation V
IN
= ±2.5Vp-p at 100kHz –80 ✻ dB
VOLTAGE REFERENCE
Internal 2.475 2.5 2.525 ✻✻✻ V
Internal Drift ±25 ✻ ppm/°C
Internal Noise 50 ✻ µVp-p
Internal Source Current 2 ✻ mA
Internal Load Rejection 0.005 ✻ mV/µA
Internal PSRR 65 ✻ dB
External Voltage Range 1.2 2.5 2.6 ✻✻✻ V
Input Current 0.05 1 ✻✻ µA
Input Capacitance 5 ✻ pF
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels: V
IH
IIH = +5µA 3.0
+VDD + 0.3
✻✻V
V
IL
IIL = +5µA –0.3 0.8 ✻✻V
V
OH
IOH = –500µA 3.5 ✻ V
V
OL
IOL = 500µA 0.4 ✻ V
External Clock 0.2 8 ✻✻MHz
Data Format Binary Two’s Complement ✻
POWER SUPPLY REQUIREMENTS
Power Supply Voltage, +V 4.75 5 5.25 ✻✻✻ V
Quiescent Current, +V
A
58 ✻✻ mA
Power Dissipation 25 40 ✻✻ mW
✻ Specifications same as ADS7862Y.
3
ADS7862
®
PIN NAME DESCRIPTION
1 REF
IN
Reference Input
2 REF
OUT
+2.5V Reference Output. Connect directly to REF
IN
(pin 1) when using internal reference.
3 AGND Analog Ground
4+V
A
Analog Power Supply, +5VDC. Connect directly to
digital power supply (pin 24). Decouple to analog
ground with a 0.1µF ceramic capacitor and a 10µF
tantalum capacitor.
5 DB11 Data Bit 11, MSB
6 DB10 Data Bit 10
7 DB9 Data Bit 9
8 DB8 Data Bit 8
9 DB7 Data Bit 7
10 DB6 Data Bit 6
11 DB5 Data Bit 5
12 DB4 Data Bit 4
13 DB3 Data Bit 3
14 DB2 Data Bit 2
15 DB1 Data Bit 1
16 DB0 Data Bit 0, LSB
17 BUSY HIGH when a conversion is in progress.
18 CONVST Convert Start
19 CLOCK An external CMOS-compatible clock can be applied to
the CLOCK input to synchronize the conversion pro-
cess to an external source. The CLOCK pin controls
the sampling rate by the equation: CLOCK 16 • f
SAMPLE
.
20 CS Chip Select
21 RD Synchronization pulse for the parallel output. During a
Read operation, the first falling edge selects the A
register and the second edge selects the B register,
A0, then controls whether input 0 or input 1 is read.
22 A0 On the falling edge of Convert Start, when A0 is LOW
Channel A0 and Channel B0 are converted and when
it is HIGH, Channel A1 and Channel B1 are converted.
During a Read operation, the first falling edge selects
the A register and the second edge selects the B of RD
register, A0, then controls whether input 0 or input 1 is
read.
23 DGND Digital Ground. Connect directly to analog ground (pin 3).
24 +V
D
Digital Power Supply, +5VDC
25 CH B1+ Non-Inverting Input Channel B1
26 CH B1– Inverting Input Channel B1
27 CH B0+ Non-Inverting Input Channel B0
28 CH B0– Inverting Input Channel B0
29 CH A1– Inverting Input Channel A1
30 CH A1+ Non-Inverting Input Channel A1
31 CH A0– Inverting Input Channel A0
32 CH A0+ Non-Inverting Input Channel A0
PIN CONFIGURATION
Top View
PIN DESCRIPTIONS
ABSOLUTE MAXIMUM RATINGS
Analog Inputs to AGND: Any Channel Input ........ –0.3V to (+VD + 0.3V)
REF
IN
............................. –0.3V to (+VD + 0.3V)
Digital Inputs to DGND .......................................... –0.3V to (+V
D
+ 0.3V)
Ground Voltage Differences: AGND, DGND ................................... ±0.3V
+V
D
to AGND......................... –0.3V to +6V
Power Dissipation .......................................................................... 325mW
Maximum Junction Temperature................................................... +150°C
Operating Temperature Range ........................................ –40°C to +85°C
Storage Temperature Range ......................................... –65°C to +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation to
complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published specifications.
REF
IN
REF
OUT
AGND
+V
A
DB11
DB10
DB9
DB8
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
+V
D
DGND
A0
RD
CS
CLOCK
CONVST
BUSY
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
9 10111213141516
CH A0+
CH A0–
CH A1+
CH A1–
CH B0–
CH B0+
CH B1–
CH B1+
32 31 30 29 28
ADS7862
27 26 25
4
ADS7862
®
PACKAGE/ORDERING INFORMATION
MAXIMUM MAXIMUM
RELATIVE GAIN PACKAGE SPECIFICATION
ACCURACY ERROR DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT
PRODUCT (LSB) (%) PACKAGE NUMBER
(1)
RANGE MARKING
(2)
NUMBER
(3)
MEDIA
ADS7862Y ±2 ±0.75 TQFP-32 351 –40°C to +85°C A62 ADS7862Y/250 Tape and Reel
ADS7862Y
""""""ADS7862Y/2K5 Tape and Reel
ADS7862YB ±1 ±0.5 TQFP-32 351 –40°C to +85°C A62 ADS7862YB/250 Tape and Reel
ADS7862YB
""""""ADS7862YB/2K5 Tape and Reel
NOTE: (1) For detail drawing and dimension table, please see end of data sheet or Package Drawing File on Web. (2) Performance Grade information is marked
on the reel. (3) Models with a slash(/) are available only in Tape and reel in quantities indicated (e.g. /250 indicates 250 units per reel, /2K5 indicates 2500 devices
per reel). Ordering 2500 pieces of ”ADS7862Y/2K5“ will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to the
www.burr-brown.com web site under Applications and Tape and Reel Orientation and Dimensions.
BASIC OPERATION
REF
IN
REF
OUT
AGND
+V
A
DB11
DB10
DB9
DB8
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
+V
D
DGND
A0
RD
CS
CLOCK
CONVST
BUSY
Address Select
Read Input
Chip Select
Clock Input
Conversion Start
Busy Output
ADS7862Y
10µF
+
0.1µF
+5V
Analog Supply
+
32
31
30
29
28
27
26
25
CH A0+
CH A0–
CH A1+
CH A1–
CH B0–
CH B0+
CH B1–
CH B1+
9
10
11
12
13
14
15
16
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
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