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| 型號： | ADS62C17IRGCT |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 43/68頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 11BIT DUAL 200MSPS 64VQFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 11 |
| 采樣率（每秒）： | 200M |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 1.1W |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 64-VQFN 裸露焊盤（9x9） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 輸入數(shù)目和類型： | 2 個差分，單極 |
| 產(chǎn)品目錄頁面： | 888 (CN2011-ZH PDF) |
| 其它名稱： | 296-24232-6 |
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External reference
SNR ENHANCEMENT USING SNRBOOST
-140
-120
-100
-80
-60
-40
-20
0
Amplitude-dB
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
f-Frequency-MHz
CenterFrequency
=F
S x0.25
Fs=200MSPS
Fin=150MHz
SNRBoostCoeff1=0x0F,
SNRBoostCoeff2=0x01,
SLAS631A – APRIL 2009 – REVISED JULY 2009 ............................................................................................................................................................. www.ti.com
When the device is in external reference mode, the VCM acts as a reference input pin. The voltage forced on the
VCM pin is buffered and gained by 1.33 internally, generating the REFP and REFM voltages. The differential
input voltage corresponding to full-scale is given by the following:
Full-scale differential input pp = (Voltage forced on VCM) × 1.33
In this mode, the 1.5V common-mode voltage to bias the input pins has to be generated externally.
SNRBoost technology makes it possible to overcome SNR limitations due to quantization noise. With SNRBoost,
enhanced SNR can be obtained for any bandwidth (less than Nyquist or Fs/2, see Table 1). The SNR
improvement is achieved without affecting the default harmonic performance. SNRBoost is disabled after reset; it
can be enabled using register bit <SNRBoost Enable> or using the control pins CTRL1, 2, 3.
(While using the register bits to control SNRBoost, keep CTRL1, CTRL2, CTRL3 low. To use the CTRL pins as
SNRBoost control, reset the <SNRBoost Enable> register bits).
When it is enabled, the noise floor in the spectrum acquires a typical bath-tub shape as shown in Figure 51. The
bath-tub is centered around a specific frequency (called center frequency). The center frequency is located
mid-way between two corner frequencies, which are specified by the SNRBoost coefficients (Register bits
<SNRBoost Coeff1> and SNRBoost Coeff2>).
Table 9 shows the relation between each coefficient and its corner frequency. By choosing appropriate
coefficients, the bath-tub can be positioned over the frequency range 0 to Fs/2 (Table 10 shows some
examples). By positioning the bath-tub within the desired signal band, SNR improvement can be achieved (see
Table 1). Note that as the bandwidth is increased, the amount of SNR improvement reduces.
Figure 51. Specturm with SNRBoost Enabled
Table 9. Setting the Corner Frequency
SNRBoost Coefficient Value
Normalized Corner Frequency
SNRBoost Coefficient value
Normalized Corner Frequency
(f/fs)
7
0.420
F
0.230
6
0.385
E
0.210
5
0.357
D
0.189
4
0.333
C
0.167
3
0.311
B
0.143
2
0.290
A
0.115
1
0.270
9
0.080
0
0.250
8
0.000
48
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): ADS62C17
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