- 您現在的位置：買賣IC網 > PDF目錄373929 > AD8021ARM (ANALOG DEVICES INC) Low Noise, High Speed Amplifier for 16-Bit Systems PDF資料下載
參數資料
| 型號： | AD8021ARM |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Noise, High Speed Amplifier for 16-Bit Systems |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | MO-187AA, MSOP-8 |
| 文件頁數： | 17/20頁 |
| 文件大小： | 467K |
| 代理商： | AD8021ARM |
REV. D
AD8021
–17–
Table II. Summary of ADC Driver Performance,
f
C
= 65 kHz, V
OUT
= 10 V p-p
Parameter
Measurement
Unit
Second Harmonic Distortion
Third Harmonic Distortion
THD
SFDR
–101.3
–109.5
–100.0
100.3
dB
dB
dB
dB
50
5V
AD8021
+
–
–12V
+12V
AD7665
570kSPS
1
50
3
2
R
F
750
OPTIONAL C
F
IN
LO
IN
HI
6
50
ADC
C
C
5
R
G
82.5
Figure 9. Noninverting ADC Driver, Gain = 10, f
C
= 100 kHz
Table III. Summary of ADC Driver Performance,
f
C
= 100 kHz, V
OUT
= 20 V p-p
Parameter
Measurement
Unit
Second Harmonic Distortion
Third Harmonic Distortion
THD
SFDR
–92.6
–86.4
–84.4
5.4
dB
dB
dB
dB
Figure 9 shows another ADC driver connection. The circuit was
tested with a noninverting gain of 10.1 and an output voltage of
approximately 20 V p-p for optimum resolution and noise per-
formance. No filtering was used. An FFT was performed using
Analog Devices’ evaluation software for the AD7665 16-bit
converter. The results are listed in Table III.
DIFFERENTIAL DRIVER
The AD8021 is uniquely suited as a low noise differential driver
for many ADCs, balanced lines, and other applications requiring
differential drive. If pairs of internally compensated op amps are
configured as inverter and follower, the noise gain of the inverter
will be higher than that of the follower section, resulting in an
imbalance in the frequency response (see Figure 11).
A better solution takes advantage of the external compensation
feature of the AD8021. By reducing the C
COMP
value of the inverter,
its bandwidth may be increased to match that of the follower,
avoiding compromises in gain bandwidth and phase delay. The
inverting and noninverting bandwidths can be closely matched
using the compensation feature, thus minimizing distortion.
DISABLE
V
OUT
8
7
6
1
2
3
LOGIC REFERENCE
–IN
+IN
–V
S
4
+V
S
5
BYPASS
CAPACITOR
GROUND
PLANE
COMPENSATION
CAPACITOR
GROUND
PLANE
(TOP VIEW)
BYPASS
CAPACITOR
METAL
C
COMP
Figure 7. Recommended Location of Critical
Components and Guard Ring
DRIVING 16-BIT ADCS
Low noise and adjustable compensation make the AD8021
especially suitable as a buffer/driver for high resolution analog-
to-digital converters.
As seen in TPC 15, the harmonic distortion is better than 90 dB at
frequencies between 100 kHz and 1 MHz. This is a real advantage
for complex waveforms that contain high frequency information,
as the phase and gain integrity of the sampled waveform can be
preserved throughout the conversion process. The increase in
loop gain results in improved output regulation and lower noise
when the converter input changes state during a sample. This
advantage is particularly apparent when using 16-bit high resolu-
tion ADCs with high sampling rates.
Figure 8 shows a typical ADC driver configuration. The AD8021
is in an inverting gain of –7.5, f
C
is 65 kHz, and its output voltage
is 10 V p-p. The results are listed in Table II.
50
5V
AD8021
+
–
–12V
+12V
AD7665
570kSPS
1
590
3
2
R
F
1.5k
IN
LO
IN
HI
6
C
C
5
10pF
56pF
R
G
200
65kHz
Figure 8. Inverting ADC Driver, Gain = –7.5, f
C
= 65 kHz
相關PDF資料 |
PDF描述 |
|---|---|
| AD8021ARM-REEL | Low Noise, High Speed Amplifier for 16-Bit Systems |
| AD8021ARM-REEL7 | Low Noise, High Speed Amplifier for 16-Bit Systems |
| AD8021ARZ | Low Noise, High Speed Amplifier for 16-Bit Systems |
| AD8021ARZ-REEL7 | Low Noise, High Speed Amplifier for 16-Bit Systems |
| AD8021ARZ-REEL | Low Noise, High Speed Amplifier for 16-Bit Systems |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8021ARM-REEL | 功能描述:IC OPAMP VF LN LP LDIST 8MSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數:4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| AD8021ARM-REEL7 | 功能描述:IC OPAMP VF LN LP LDIST 8MSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數:2 輸出類型:滿擺幅 轉換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| AD8021ARMZ | 功能描述:IC OPAMP VF LN LP LDIST 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產品培訓模塊:Differential Circuit Design Techniques for Communication Applications 標準包裝:1 系列:- 放大器類型:RF/IF 差分 電路數:1 輸出類型:差分 轉換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應商設備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| AD8021ARMZ-REEL | 功能描述:IC OPAMP VF LN LP LDIST 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數:4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| AD8021ARMZ-REEL7 | 功能描述:IC OPAMP VF LN LP LDIST 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數:4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
發布緊急采購，3分鐘左右您將得到回復。