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參數(shù)資料
| 型號(hào)： | AD790SQ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR PREC W/LATCH 8CDIP |
| 設(shè)計(jì)資源： | Automated Calibration Technique That Reduces AD5360 Offset Voltage to Less Than 1 mV (CN0123) |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 帶鎖銷 |
| 元件數(shù)： | 1 |
| 輸出類型： | CMOS，TTL |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 7 V，±2.25 V ~ 16.5 V |
| 電壓 - 輸入偏移（最小值）： | 1.5mV @ 5V |
| 電流 - 輸入偏壓（最小值）： | 5µA @ 5V |
| 電流 - 靜態(tài)（最大值）： | 10mA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 95dB CMRR，90dB PSRR |
| 傳輸延遲（最大）： | 50ns |
| 磁滯： | 500µV |
| 工作溫度： | -55°C ~ 125°C |
| 封裝/外殼： | 8-CDIP（0.300"，7.62mm） |
| 安裝類型： | 通孔 |
| 包裝： | 管件 |
AD790
REV. D
–8–
2
3
1
4
6
7
5
8
TTL
LEVEL
OUTPUT
400 *
5V
+
GND
STANDARD
SCHOTTKY
DIODE
1k
A RESISTOR UP TO 10k
MAYBE USED TO
REDUCE THE SOURCE AND SINK CURRENT OF
THE DRIVER. HOWEVER, THIS WILL SLIGHTLY
LOWER THE MAXIMUM USABLE CLOCK RATE.
*
BIPOLAR
SIGNAL
INPUT
4.7V
0.3V
5V
–
Figure 11. A Bipolar to CMOS TTL Line Receiver (N, Q
Package Pinout)
Bipolar to CMOS/TTL
It is sometimes desirable to translate a bipolar signal (e.g.,
±5 V) coming from a communications cable or another section
of the system to CMOS/TTL logic levels; such an application is
referred to as a line receiver. Previously, the interface to the
bipolar signal required either a dual (
±) power supply or a refer-
ence voltage level about which the line receiver would switch.
The AD790 may be used in a simple circuit to provide a unique
capability: the ability to receive a bipolar signal while powered
from a single 5 V supply. Other comparators cannot perform
this task. Figure 11 shows a 1 k
resistor in series with the input
signal which is then clamped by a Schottky diode, holding the
input of the comparator at 0.4 V below ground. Although the
comparator is specified for a common mode range down to –VS,
(in this case ground) it is permissible to bring one of the inputs
a few hundred mV below ground. The comparator switches
around this level and produces a CMOS/TTL compatible swing.
The circuit will operate to switching frequencies of 20 MHz.
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