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| 型號(hào)： | AD8042AR-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R DUAL LP 8SOIC |
| 設(shè)計(jì)資源： | Single-Ended-to-Differential Converters for Voltage Output and Current Output DACs Using AD8042 (CN0143) |
| 標(biāo)準(zhǔn)包裝： | 750 |
| 放大器類(lèi)型： | 電壓反饋 |
| 電路數(shù)： | 2 |
| 輸出類(lèi)型： | 滿(mǎn)擺幅 |
| 轉(zhuǎn)換速率： | 225 V/µs |
| -3db帶寬： | 170MHz |
| 電流 - 輸入偏壓： | 1.2µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 6mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 12 V，±1.5 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
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AD8042
Rev. E | Page 14 of 16
Single-Ended-to-Differential Driver
Using a cross-coupled, single-ended-to-differential converter
(SEDC), the AD8042 makes a good general-purpose differential
line driver. This SEDC can be used for applications such as
driving Category-5 (CAT-5) twisted pair wires. Figure 39 shows
a configuration for a circuit that performs this function that can
be used for video transmission over a differential pair or various
data communication purposes.
01
05
9-
0
39
10F
60.4
100
RF
1k
RIN
1k
49.9
RA
1k
RA
1k
RB
1k
RB
1k
0.1F
50m
121
AMP1
8
3
2
6
5
7
4
1
VIN
AMP2
+5V
VOUT
AD8042
10F
0.1F
–5V
Figure 39. Single-Ended-to-Differential Twisted Pair Line Driver
Each of the op amps of the AD8042 is configured as a unity gain
follower by the feedback resistors (RA). Each op amp output also
drives the other as a unity gain inverter via RB, creating a totally
symmetrical circuit.
B
If the noninverting input of AMP2 is grounded and a small
positive signal is applied to the noninverting input of AMP1,
the output of AMP1 is driven to saturation in the positive
direction and the input of AMP2 is driven to saturation in the
negative direction. This is similar to the way a conventional op
amp behaves without any feedback.
If a resistor (RF) is connected from the output of AMP2 to the
noninverting input of AMP1, negative feedback is provided, which
closes the loop. An input resistor (RIN) makes the circuit look
like a conventional inverting op amp configuration with
differential outputs.
The gain of this circuit from input to either output is ±RF/RIN, or
the single-ended-to-differential gain is 2 × RF/RIN. This gives the
circuit the advantage of being able to adjust its gain by changing
a single resistor.
The cable has a characteristic impedance of about 120 Ω. Each
driver output is back terminated with a pair of 60.4 Ω resistors
to make the source look like 120 Ω. The receive end is terminated
with 121 Ω, and the signal is measured differentially with a pair
of scope probes. One channel on the oscilloscope is inverted
and then the signals are added.
50 meters of CAT-5 cable.
VIN
VOUT
0
10
59
-04
0
50ns
1V
100
10
0%
90
200mV
Figure 40. Differential Driver Frequency Response
Single-Supply Differential A/D Driver
The single-ended-to-differential converter circuit is also useful
as a differential driver for video speed, single-ended, differential
input ADCs. Figure 41 is a schematic that shows such a circuit
differentially driving an AD9220, a 12-bit, 10 MSPS ADC.
0
10
59-
041
VINA
VINB
CAPT
CAPB
VREF
SENSE
CML
CLK
AD9220
19
27
25
14
13
12
11
10
9
8
7
6
5
4
3
2
+5V
0.1F
2.49k
1k
2.49k
0.1F
DVDD
AVDD
REFCOM DVSS AVSS AVSS
16
28
15
26
OTR
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12
CLOCK
1
18
17
22
10/16
8
3
2
6
5
7
4
+5V
1
VIN
+5V
AD8042
0.1F
Figure 41. AD8042 Differential Driver for the AD9220 12-Bit, 10 MSPS ADC
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