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AD7228LNZ Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD7228LNZ
Szczegółowy opis  LC2MOS Octal 8-Bit DAC
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Strona internetowa  http://www.analog.com
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AD7228LNZ Arkusz danych(HTML) 11 Page - Analog Devices

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AD7228
Data Sheet
Rev. D | Page 10 of 15
Table 7. Unipolar Code Table
DAC Latch Contents
MSB
LSB1
Analog Output
1 1 1 1
1 1 1 1
+VREF(255/256)
1 0 0 0
0 0 0 1
+VREF(129/256)
1 0 0 0
0 0 0 0
+VREF
2
256
128
REF
V
+
=
0 1 1 1
1 1 1 1
+VREF(127/256)
0 0 0 0
0 0 0 1
+VREF(1/256)
0 0 0 0
0 0 0 0
0 V
1
1 LSB = (VREF)(2−8) = VREF (1/256).
Bipolar Output Operation
Each of the DACs on the AD7228 can be individually configured
for bipolar output operation. This is possible using one external
amplifier and two resistors per channel. Figure 11 shows a circuit
used to implement offset binary coding (bipolar operation) with
DAC 1 of the AD7228. In this case,
)
(
)
(
1
1
REF
REF
OUT
V
R1
R2
V
D
R1
R2
V
×
×
×
 +
=
With R1 = R2,
VOUT = (2D1 − 1) × (VREF)
where D1 is a fractional representation of the digital word in
Latch 1 of the AD7228 (0 ≤ D1 ≤ 255/256).
Table 8. Bipolar Code Table
DAC Latch Contents
MSB
LSB
Analog Output
1 1 1 1
1 1 1 1
+VREF(127/128)
1 0 0 0
0 0 0 1
+VREF(1/128)
1 0 0 0
0 0 0 0
0 V
0 1 1 1
1 1 1 1
−VREF(1/128)
0 0 0 0
0 0 0 1
−VREF(127/128)
0 0 0 0
0 0 0 0
−VREF(128/128) = −VREF
Mismatch between R1 and R2 causes gain and offset errors;
therefore, these resistors must match and track over temperature.
The AD7228 can be operated from a single supply or from dual
supplies. Table 8 shows the digital code vs. output voltage
relationship for the circuit of Figure 11 with R1 = R2.
AC Reference Signal
In some applications, it may be desirable to have an ac signal
applied as the reference input to the AD7228. The AD7228 has
multiplying capability within the upper (10 V) and lower (2 V)
limits of reference voltage when operated with dual supplies.
Therefore, ac signals must be ac-coupled and biased up before
being applied to the reference input. Figure 12 shows an ac
signal applied to the reference input of the AD7228. For input
frequencies up to 50 kHz, the output distortion typically remains
less than 0.1%. The typical 3 dB bandwidth for small signal
inputs is 800 kHz.
12
9
11
1
GND
*ADDITIONAL PINS OMITTED FOR CLARITY.
VSS
VDD
VOUT
VOUT1
R1
10kΩ
±0.1%
R2
10kΩ
±0.1%
+15V
–15V
VREF
AD7228*
VREF
10
DAC 1
Figure 11. Bipolar Output Circuit
+10V
REFERENCE
INPUT
15kΩ
+15V
–5V
10kΩ
+2V
12
9
11
1
GND
*ADDITIONAL PINS OMITTED FOR CLARITY.
VSS
VDD
VOUT1
VREF
+15V
AD7228*
10
DAC 1
+4V
–4V
Figure 12. Applying an AC Signal to the AD7228


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