Datasheet > ADA4932-1YCPZ-R21

ADA4932-1YCPZ-R21

更新时间： 2022-04-12 17:14:32

品牌	Logo	应用领域
亚德诺 - ADI		驱动器
页数	文件大小	规格书
28页	477K
描述
Low Power Differential ADC Driver

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中文翻译

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数据手册

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ADA4932-1/ADA4932-2

HIGH PERFORMANCE ADC DRIVING

The ADA4932-x is ideally suited for broadband dc-coupled

applications. The circuit in Figure 67 shows a front-end

connection for an ADA4932-1 driving an AD9245, a 14-bit,

20 MSPS/40 MSPS/65 MSPS/80 MSPS ADC, with dc coupling

on the ADA4932-1 input and output. (The AD9245 achieves

its optimum performance when driven differentially.) The

ADA4932-1 eliminates the need for a transformer to drive the

ADC and performs a single-ended-to-differential conversion and

buffering of the driving signal.

In this example, the signal generator has a 1 V p-p symmetric,

ground-referenced bipolar output when terminated in 50 ꢁ.

The V_ꢀCMinput is bypassed for noise reduction, and set externally

with 1% resistors to maximize output dynamic range on the

tight 3.3 V supply.

Because the inputs are dc-coupled, dc common-mode current

flows in the feedback loops, and a nominal dc level of 0.84 V is

present at the amplifier input terminals. A fraction of the output

signal is also present at the input terminals as a common-mode

signal; its level is equal to the ac output swing at the noninverting

output, divided down by the feedback factor of the lower loop.

In this example, this ripple is 0.5 V p-p × [524.5/(524.5 + 511)] =

0.25 V p-p. This ac signal is riding on the 0.84 V dc level, produc-

ing a voltage swing between 0.72 V and 0.97 V at the input

terminals. This is well within the specified limits of 0.2 V to 1.5 V.

The ADA4932-1 is configured with a single 3.3 V supply and a

gain of 1 for a single-ended input to differential output. The

53.6 ꢁ termination resistor, in parallel with the single-ended

input impedance of approximately 665 ꢁ, provides a 50 ꢁ

termination for the source. The additional 25.5 ꢁ (524.5 ꢁ

total) at the inverting input balances the parallel impedance

of the 50 ꢁ source and the termination resistor driving the

noninverting input.

With an output common-mode voltage of 1.65 V, each ADA4932-1

output swings between 1.4 V and 1.9 V, opposite in phase, provid-

ing a gain of 1 and a 1 V p-p differential signal to the ADC input.

The differential RC section between the ADA4932-1 output and

the ADC provides single-pole low-pass filtering and extra buffering

for the current spikes that are output from the ADC input when its

SHA capacitors are discharged.

The AD9245 is configured for a 1 V p-p full-scale input by

connecting its SENSE pin to VREF, as shown in Figure 67.

511Ω

3.3V

= 1V p-p

= 1.65V

OUT, dm

OUT, cm

1V p-p CENTERED

AT GROUND

0.1µF

10kΩ

499Ω

50Ω

33Ω

VIN–

AVDD

53.6Ω

OCM

20pF

2V p-p

AD9245

ADA4932-1

10kΩ

SIGNAL

GENERATOR

0.1µF

499Ω

VIN+ VREF SENSE AGND

33Ω

25.5Ω

0.1µF

10µF

511Ω

Figure 67. ADA4932-1 Driving an AD9245 ADC with DC-Coupled Input and Output

Rev. A | Page 25 of 28

1...22 23 242526 27 28

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与ADA4932-1YCPZ-R21相关器件

型号	品牌	获取价格	描述	数据表
ADA4932-1YCPZ-R7	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-1YCPZ-R71	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-1YCPZ-RL	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-1YCPZ-RL1	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-2	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-2YCPZ	ADI	获取价格	DUAL LINE DRIVER, QCC24
ADA4932-2YCPZ-R2	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-2YCPZ-R21	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-2YCPZ-R7	ADI	获取价格	Low Power Differential ADC Driver
ADA4932-2YCPZ-R71	ADI	获取价格	Low Power Differential ADC Driver

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