AD7523 Ver la hoja de datos (PDF) - Intersil
Número de pieza
componentes Descripción
Fabricante
AD7523 Datasheet PDF : 9 Pages
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AD7523, AD7533
Offset Adjustment
1. Adjust VREF to approximately +10V.
2. Connect all digital inputs to “Logic 1”.
3. Adjust IOUT2 amplifier offset adjust trimpot for 0V ±1mV at
IOUT2 amplifier output.
4. Connect MSB (Bit 1) to “Logic 1” and all other bits to “Logic 0”.
5. Adjust IOUT1 amplifier offset adjust trimpot for 0V ±1mV at
VOUT.
Gain Adjustment
1. Connect all digital inputs to V+.
2. Monitor VOUT for a -VREF (1 - 2-9) volts reading.
3. To increase VOUT, connect a series resistor of up to 250Ω
between VOUT and RFEEDBACK.
4. To decrease VOUT, connect a series resistor of up to 250Ω
between the reference voltage and the VREF terminal.
DIGITAL FREQUENCY
CONTROL WORD
CALIBRATE
10K
6.8V
(2)
+15V
VDD NC
MSB
LSB
15 14 16
4
AD7523/
AD7533
13 3
1 OUT1
OUT2
2
1K
-
A26
+
10K 1%
4.7K
10K 1%
SQUARE
WAVE
C1
-
6A1
+
TRIANGULAR
WAVE
FIGURE 5. PROGRAMMABLE FUNCTION GENERATOR
+15V
VIN
RFB
OUT2
OUT1
16
14
2
4
AD7523/
AD7533
1
11
3
15
BIT 1
MSB
LSB
DIGITAL
INPUT
“D”
BIT 8 (10) (AD7533)
VREF
-
6
VOUT
+
VOUT = -VIN/D
Where:
D = B----2-i--t-1---1-- + B----2-i--t-2---2-- + …B----2-i--t-2---8--
0 ≤ D ≤ 22----55---56--
FIGURE 6. DIVIDER (DIGITALLY CONTROLLED GAIN)
VREF
+15V
BIT 1
15 14 16
MSB 4
DIGITAL
INPUT
AD7523/
AD7533 1
-
“D” LSB
6
13 3 2
+
BIT 8
(10) (AD7533)
R1
-
6
+
R2
VOUT
VO UT = VREF R-----1---R--+--2---R----2-- – R-----1R-----1+----D-R----2--
Where D = B---2--i-t-1--1-- + B---2--i-t-2--2-- + …B---2--i-t-8--8--
0 ≤ D ≤ 22----55---56--
FIGURE 7. MODIFIED SCALE FACTOR AND OFFSET
10-14
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