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PDF ADC10734CIWM Data sheet ( Hoja de datos )
| Número de pieza | ADC10734CIWM | |
| Descripción | 10-Bit Plus Sign Serial I/O A/D Converters with Mux/ | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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
1 page  
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−
otherwise specified.
= 2.5V for Signed
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)
DYNAMIC SIGNED CONVERTER CHARACTERISTICS
S/(N+D)
ENOB
THD
IMD
Signal-to-Noise Plus Distortion Ratio
Effective Number of Bits
Total Harmonic Distortion
Intermodulation Distortion
Full-Power Bandwidth
VIN = 4.85 VPP,
and fIN = 1 kHz to 15 kHz
VIN = 4.85 VPP,
and fIN = 1 kHz to 15 kHz
VIN = 4.85 VPP,
and fIN = 1 kHz to 15 kHz
VIN = 4.85 VPP,
and fIN = 1 kHz to 15 kHz
VIN = 4.85 VPP, where
S/(N + D) Decreases
3 dB
67
10.8
−78
−85
380
dB
Bits
dB
dB
kHz
Multiplexer Channel to Channel
Crosstalk
fIN = 15 kHz
−80
dB
DYNAMIC UNSIGNED CONVERTER CHARACTERISTIC
S/(N+D)
THD
IMD
Signal-to-Noise Plus Distortion Ratio
Effective Bits
Total Harmonic Distortion
Intermodulation Distortion
Full-Power Bandwidth
VREF+ = 4.096V,
VIN = 4.0 VPP, and
fIN =1 kHz to 15 kHz
VREF+ = 4.096V,
VIN = 4.0 VPP, and
fIN = 1 kHz to 15 kHz
VREF+ = 4.096V,
VIN = 4.0 VPP, and
fIN = 1 kHz to 15 kHz
VREF+ = 4.096V,
VIN = 4.0 VPP, and
fIN = 1 kHz to 15 kHz
VIN = 4.0 VPP,
VREF+ = 4.096V,
where S/(N+D) decreases
3 dB
60
9.8
−70
−73
380
dB
Bits
dB
dB
kHz
Multiplexer Channel to Channel
fIN = 15 kHz,
Crosstalk
VREF+ = 4.096V
REFERENCE INPUT AND MULTIPLEXER CHARACTERISTICS
−80
dB
Reference Input Resistance
7 kΩ
5.0 kΩ(min)
9.5 kΩ(max)
CREF
Reference Input Capacitance
MUX Input Voltage
70 pF
−50 mV(min)
AV+ +50 mV
(max)
CIM MUX Input Capacitance
On Channel = 5V and
47
−0.4
−3.0
pF
µA(max)
Off Channel Leakage Current
(Note 15)
Off Channel = 0V
On Channel = 0V and
0.4 3.0 µA(max)
Off Channel = 5V
On Channel Leakage Current
On Channel = 5V and
0.4 3.0 µA(max)
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Linearity Error
vs Clock Frequency
Linearity Error
vs Reference Voltage
Linearity Error
vs Temperature
DS011390-41
10-Bit Unsigned
Signal-to-Noise + THD Ratio
vs Input Signal Level
DS011390-42
Spectral Response with
34 kHz Sine Wave
DS011390-43
Power Bandwidth Response
with 380 kHz Sine Wave
DS011390-44
DS011390-45
Typical Reference Performance Characteristics
Load Regulation
Line Regulation
Output Drift
vs Temperature
(3 Typical Parts)
DS011390-46
DS011390-47
DS011390-48
DS011390-49
11 www.national.com
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