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AD7112CR Arkusz danych(PDF) 7 Page - Analog Devices

Numer części AD7112CR
Szczegółowy opis  LC2MOS LOGDAC Dual Logarithmic D/A Converter
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Strona internetowa  http://www.analog.com
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AD7112CR Arkusz danych(HTML) 7 Page - Analog Devices

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AD7112
REV. 0
–7–
Another error arises from the output amplifier’s input offset volt-
age. The amplifier is operated with a fixed feedback resistance,
but the equivalent source impedance (the AD7112 output im-
pedance) varies as a function of the attenuation level. This has
the effect of varying the noise gain of the amplifier thus creating
a varying error due to amplifier offset voltage. It is recom-
mended that an amplifier with less than 50
µV of input offset be
used (such as the AD712 or ADOP07) in dc applications. Am-
plifiers with a large input offset voltage may cause audible
thumps in audio applications due to dc output changes. The
AD7112 accuracy is specified and tested using only the internal
feedback resistor. Any gain error (i.e., mismatch of RFB to the
R–2R ladder) that may exist in the AD7112 D/A converter cir-
cuit results in a constant attenuation error over the whole range.
The AD7112 accuracy is specified relative to 0 dB attenuation,
hence gain trim resistors can be used to adjust VOUT = VIN pre-
cisely (i.e., 0 dB attenuation) with input code 00000000. For
further information on gain error refer to the “CMOS DAC Ap-
plication Guide” which is available from Analog Devices, Publi-
cation Number G872b-8-1/89.
TYPICAL PERFORMANCE CHARACTERISTICS
6
0
5
3
1
2
0
5
4
34
2
1
VIN – Volts
TA = +25°C
ALL DIGITAL INPUTS
TIED TOGETHER
Figure 6. Supply Current vs. Logic Input Level
FREQUENCY – Hz
OP275
C1 = 0pF
10
–30
104
107
0
–20
105
–10
OP275
C1 = 15pF
AD712
C1 = 0pF
AD712
C1 = 15pF
106
VDD = +5V
TA = +25°C
DATA INPUT CODE = 0000 0000
VIN = 1V rms
Figure 7. Frequency Response with AD712 and OP275
10
90
100
0%
200ns
5V
C1 = 0pF
C1 = 15pF
DATA CHANGE
FROM 00H TO 80H
5V
A1
0.8V
Figure 4. Response of AD7112 with AD712
10
90
100
0%
200ns
5V
C1 = 0pF
C1 = 15pF
DATA CHANGE
FROM 00H TO 80H
5V
A1
0.8V
Figure 5. Response of AD7112 with OP275


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