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參數(shù)資料
| 型號(hào)： | AD7521LN |
| 廠商： | Intersil |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | CONV D/A 12BIT 1MHZ 2LSB 18-DIP |
| 標(biāo)準(zhǔn)包裝： | 20 |
| 位數(shù)： | 12 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 20mW |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 18-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 18-PDIP |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 2 電流，單極；2 電流，雙極 |
| 采樣率（每秒）： | 1M |
5
Applications
Unipolar Binary Operation
The circuit configuration for operating the AD7520 in
unipolar mode is shown in Figure 8. Similar circuits can be
used for AD7521. With positive and negative VREF values
the circuit is capable of 2-Quadrant multiplication. The Digital
Input Code/Analog Output Value table for unipolar mode is
given in Table 1.
Zero Offset Adjustment
1. Connect all digital inputs to GND.
2. Adjust the offset zero adjust trimpot of the output
operational amplifier for 0V at VOUT.
Gain Adjustment
1. Connect all digital inputs to V+.
2. Monitor VOUT for a -VREF (1-2-N) reading. (N = 8 for
AD7520 and N = 10 for AD7521).
FIGURE 4. NOISE
FIGURE 5. OUTPUT CAPACITANCE
FIGURE 6. FEEDTHROUGH ERROR
FIGURE 7. OUTPUT CURRENT SETTLING TIME
Test Circuits The following test circuits apply for the AD7520. Similar circuits are used for the AD7521. (Continued)
15
2
5
4
13 3 1
AD7520
101ALN
-
+
0.1
F
IOUT1
IOUT2
14
10k
VOUT
100
15
F
1K
+15V
50k
1k
-50V
f = 1kHz
BW = 1Hz
QUAN
TECH
MODEL 134D
WAVE
ANALYZER
+11V (ADJUST FOR VOUT = 0V)
15
16
1
5
4
13 3
2
AD7520
BIT 1 (MSB)
BIT 10 (LSB)
14
+15V
NC
SCOPE
100mVP-P
1MHz
NC
1k
+15V
15
16
1
5
4
13 3
2
AD7520
BIT 1 (MSB)
BIT 10 (LSB)
14
+15V
VREF = 20VP-P
GND
IOUT1
IOUT2
2
3
6
VOUT
100kHz SINE WAVE
HA2600
-
+
15
1
5
4
13 3
2
AD7520
BIT 1 (MSB)
BIT 10 (LSB)
14
+15V
SCOPE
+100mV
100
GND
VREF
DIGITAL
IOUT2
EXTRAPOLATE
5t: 1% SETTLING (1mV)
8t: 0.03% SETTLING
t = RISE TIME
INPUT
+5V
0V
+10V
15
16
1
5
4
13 3
2
AD7520
BIT 1 (MSB)
BIT 10 (LSB)
14
+15V
VREF
GND
IOUT1
IOUT2
6
VOUT
-
+
RFEEDBACK
DIGITAL
INPUT
FIGURE 8. UNIPOLAR BINARY OPERATION (2-QUADRANT
MULTIPLICATION)
TABLE 1. CODE TABLE - UNlPOLAR BINARY OPERATION
DIGITAL INPUT
ANALOG OUTPUT
1111111111
-VREF (1-2-N)
1000000001
-VREF (1/2 + 2-N)
1000000000
-VREF/2
0111111111
-VREF (1/2-2-N)
0000000001
-VREF (2-N)
0000000000
0
NOTES:
1. LSB = 2-N VREF.
2. N = 8 for 7520
N = 10 for 7521.
AD7520, AD7521
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