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參數資料
| 型號： | AD7610BCPZ1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC |
| 中文描述： | 16位，250 kSPS的，單極/雙極可編程輸入PulSAR系列ADC的 |
| 文件頁數： | 20/32頁 |
| 文件大小： | 591K |
| 代理商： | AD7610BCPZ1 |
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AD7610
DRIVER AMPLIFIER CHOICE
Although the AD7610 is easy to drive, the driver amplifier must
meet the following requirements:
For multichannel, multiplexed applications, the driver
amplifier and the AD7610 analog input circuit must be
able to settle for a full-scale step of the capacitor array at a
16-bit level (0.0015%). For the amplifier, settling at 0.1% to
0.01% is more commonly specified. This differs significantly
from the settling time at a 16-bit level and should be verified
prior to driver selection. The
AD8021
op amp combines ultra-
low noise and high gain bandwidth and meets this settling
time requirement even when used with gains of up to 13.
The noise generated by the driver amplifier needs to be
kept as low as possible to preserve the SNR and transition
noise performance of the AD7610. The noise coming from
the driver is filtered by the external 1-pole low-pass filter
as shown in Figure 27. The SNR degradation due to the
amplifier is
Rev. 0 | Page 20 of 32
(
)
π
2
+
=
2
3
2
log
20
N
dB
NADC
V
NADC
V
LOSS
Ne
f
SNR
where:
V
NADC
is the noise of the ADC, which is:
V
20
10
2
2
SNR
INp-p
NADC
V
=
f
–3dB
is the cutoff frequency of the input filter (3.9 MHz).
N
is the noise factor of the amplifier (+1 in buffer
configuration).
e
N
is the equivalent input voltage noise density of the op
amp, in nV/√Hz.
The driver needs to have a THD performance suitable to
that of the AD7610. Figure 15 shows the THD vs. frequency
that the driver should exceed.
The AD8021 meets these requirements and is appropriate for
almost all applications. The AD8021 needs a 10 pF external
compensation capacitor that should have good linearity as an
NPO ceramic or mica type. Moreover, the use of a noninverting
+1 gain arrangement is recommended and helps to obtain the
best signal-to-noise ratio.
The
AD8022
can also be used when a dual version is needed
and a gain of 1 is present. The
AD829
is an alternative in appli-
cations where high frequency (above 100 kHz) performance is not
required. In applications with a gain of 1, an 82 pF compensation
capacitor is required. The
AD8610
is an option when low bias
current is needed in low frequency applications.
Since the AD7610 uses a large geometry, high voltage input
switch, the best linearity performance is obtained when using
the amplifier at its maximum full power bandwidth. Gaining
the amplifier to make use of the more dynamic range of the
ADC results in increased linearity errors. For applications
requiring more resolution, the use of an additional amplifier
with gain should precede a unity follower driving the AD7610.
See Table 8 for a list of recommended op amps.
Table 8. Recommended Driver Amplifiers
Amplifier
Typical Application
ADA4841-x
12 V supply, very low noise, low distortion,
low power, low frequency
AD829
±15 V supplies, very low noise, low frequency
AD8021
±12 V supplies, very low noise, high frequency
AD8022
±12 V supplies, very low noise, high
frequency, dual
AD8610/
AD8620
±13 V supplies, low bias current, low
frequency, single/dual
VOLTAGE REFERENCE INPUT/OUTPUT
The AD7610 allows the choice of either a very low temperature
drift internal voltage reference, an external reference or an external
buffered reference.
The internal reference of the AD7610 provides excellent perfor-
mance and can be used in almost all applications. However, the
linearity performance is guaranteed only with an external reference.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7610BCPZ-RL | 16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC |
| AD7610BSTZ | 16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC |
| AD7610BSTZ-RL | 16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC |
| AD7621 | 16-Bit, 1 LSB INL, 3 MSPS PulSAR ADC |
| AD7621ACP | 16-Bit, 1 LSB INL, 3 MSPS PulSAR ADC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7610BCPZ-RL | 功能描述:IC ADC 16BIT 250KSPS 48-LFCSP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯(lián) 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7610BSTZ | 功能描述:IC ADC 16BIT 250KSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7610BSTZ-RL | 功能描述:IC ADC 16BIT 250KSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯(lián) 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7611ACP | 制造商:Analog Devices 功能描述:1MSPS, 16-BIT ADC S/W PROG. INPUT RANGES - Bulk |
| AD7611AST | 制造商:Analog Devices 功能描述:1MSPS, 16-BIT ADC S/W PROG. INPUT RANGES - Bulk |
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