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Teilenummer | ADC10732 |
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Beschreibung | 10-Bit Plus Sign Serial I/O A/D Converters with Mux/ | |
Hersteller | National Semiconductor | |
Logo | ||
Gesamt 27 Seiten May 1999
ADC10731/ADC10732/ADC10734/ADC10738
10-Bit Plus Sign Serial I/O A/D Converters with Mux,
Sample/Hold and Reference
General Description
This series of CMOS 10-bit plus sign successive approxima-
tion A/D converters features versatile analog input multiplex-
ers, sample/hold and a 2.5V band-gap reference. The 1-, 2-,
4-, or 8-channel multiplexers can be software configured for
single-ended or differential mode of operation.
An input sample/hold is implemented by a capacitive refer-
ence ladder and sampled-data comparator. This allows the
analog input to vary during the A/D conversion cycle.
In the differential mode, valid outputs are obtained even
when the negative inputs are greater than the positive be-
cause of the 10-bit plus sign output data format.
The serial I/O is configured to comply with the NSC MI-
CROWIRE™ serial data exchange standard for easy inter-
face to the COPS™ and HPC™ families of controllers, and
can easily interface with standard shift registers and micro-
processors.
Features
n 0V to 5V analog input range with single 5V power
supply
n Serial I/O (MICROWIRE compatible)
n 1-, 2-, 4-, or 8-channel differential or single-ended
multiplexer
n Software or hardware power down
n Analog input sample/hold function
n Ratiometric or absolute voltage referencing
n No zero or full scale adjustment required
n No missing codes over temperature
n TTL/CMOS input/output compatible
n Standard DIP and SO packages
Key Specifications
n Resolution
n Single supply
n Power dissipation
n In powerdown mode
n Conversion time
n Sampling rate
n Band-gap reference
10 bits plus sign
5V
37 mW (Max)
18 µW
5µs (Max)
74 kHz (Max)
2.5V ±2% (Max)
Applications
n Medical instruments
n Portable and remote instrumentation
n Test equipment
ADC10738 Simplified Block Diagram
COPS™, HPC™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011390
DS011390-1
www.national.com
Electrical Characteristics (Continued)
The following specifications apply for V+ =
Characteristics, VIN− = GND for Unsigned
AV+ = DV+ = +5.0
Characteristics and
VDC,
fCLK
=VR2E.F5+M=H2z.5unVleDsCs,
VREF− = GND, VIN− = 2.5V for Signed
otherwise specified. Boldface limits ap-
ply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25˚C. (Notes 8, 9, 10)
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 11)
(Note 12)
(Limits)
REFERENCE INPUT AND MULTIPLEXER CHARACTERISTICS
(Note 15)
Off Channel = 0V
On Channel = 0V and
−0.4
−3.0
µA(max)
Off Channel = 5V
REFERENCE CHARACTERISTICS
VREFOut
∆VREF/∆T
∆VREF/∆IL
∆VREF/∆IL
Reference Output Voltage
VREFOut Temperature Coefficient
Load Regulation, Sourcing
Load Regulation, Sinking
Line Regulation
0 mA ≤ IL ≤ +4 mA
0 mA ≤ IL ≤ −1 mA
5V ±10%
2.5V ±0.5%
±40
±0.003
±0.2
±0.3
2.5V ±2%
±0.05
±0.6
±2.5
V(max)
ppm/˚C
%/mA(max)
%/mA(max)
mV(max)
ISC Short Circuit Current
Noise Voltage
∆VREF/∆t Long-term Stability
tSU Start-Up Time
DIGITAL AND DC CHARACTERISTICS
VREFOut = 0V
10 Hz to 10 kHz,
CL = 100 µF
CL = 100 µF
13
5
±120
100
22 mA(max)
µV
ppm/kHr
ms
VIN(1)
VIN(0)
IIN(1)
IIN(0)
VOUT(1)
VOUT(0)
IOUT
+ISC
−ISC
ID+
Logical “1” Input Voltage
Logical “0” Input Voltage
Logical “1” Input Current
Logical “0” Input Current
Logical “1” Output Voltage
Logical “0” Output Voltage
TRI-STATE Output Current
Output Short Circuit Source Current
Output Short Circuit Sink Current
Digital Supply Current
(Note 17)
V+ = 5.5V
V+ = 4.5V
VIN = 5.0V
VIN = 0V
V+ = 4.5V, IOUT = −360 µA
V+ = 4.5V, IOUT = −10 µA
V+ = 4.5V, IOUT = 1.6 mA
VOUT = 0V
VOUT = 5V
VOUT = 0V, V+ = 4.5V
VOUT= V+ = 4.5V
CS = HIGH, Power Up
CS = HIGH, Power Down
0.005
−0.005
−0.1
+0.1
−30
30
0.9
0.2
2.0
0.8
+2.5
−2.5
2.4
4.5
0.4
−3.0
+3.0
−15
15
1.3
0.4
V(min)
V(max)
µA(max)
µA(max)
V(min)
V(min)
V(min)
µA(max)
µA(max)
mA(min)
mA(min)
mA(max)
mA(max)
CS = HIGH, Power Down,
and CLK Off
0.5
50 µA(max)
IA+ Analog Supply Current
(Note 17)
CS = HIGH, Power Up
CS = HIGH, Power Down
2.7
3
6.0 mA(max)
15 µA(max)
IREF Reference Input Current
VREF+ = +2.5V and
CS = HIGH, Power Up
0.6 mA(max)
AC CHARACTERISTICS
fCLK Clock Frequency
3.0 2.5 MHz(max)
5 kHz(min)
Clock Duty Cycle
40 %(min)
60 %(max)
tC Conversion Time
12 12 Clock
Cycles
5 5 µs(max)
tA Acquisition Time
4.5 4.5 Clock
Cycles
2 2 µs(max)
www.national.com
6
6 Page Typical Reference Performance Characteristics (Continued)
Available
Output Current
vs Supply Voltage
DS011390-50
TRI-STATE Test Circuits and Waveforms
DS011390-10
Timing Diagrams
DS011390-12
DS011390-11
DS011390-13
www.national.com
FIGURE 3. DI Timing
12
DS011390-14
12 Page | ||
Seiten | Gesamt 27 Seiten | |
PDF Download | [ ADC10732 Schematic.PDF ] |
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