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| 型號(hào)： | AD9277-50EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 24/48頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9277 |
| 設(shè)計(jì)資源： | AD9276/77 Eval Brd Gerber Files |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 10M ~ 50M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 輸入范圍： | 733 mVpp |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD9277 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD9277BSVZ-ND - IC ADC 14BIT LNA/VGA/AAF 100TQFP |
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AD9277
Rev. 0 | Page 30 of 48
Table 10. Sensitivity and Dynamic Range Trade-Offs1, 2, 3
LNA
VGA
Channel
Gain
Full-Scale
Input (V p-p)
Input Noise
(nV/√Hz)
Postamp Gain (dB)
Typical Output Dynamic Range (dB)
(V/V)
(dB)
GAIN+ = 0 V4
GAIN+ = 1.6 V5
Input-Referred Noise6 @
GAIN+ = 1.6 V (nV/√Hz)
6
15.6
0.733
0.98
21
68.9
65.8
1.312
24
67.4
63.4
1.241
27
65.3
60.8
1.204
30
62.8
57.9
1.185
8
17.9
0.550
0.86
21
68.9
65.1
1.090
24
67.4
62.7
1.040
27
65.3
60.0
1.014
30
62.8
57.1
1.000
12
21.3
0.367
0.75
21
68.9
63.7
0.876
24
67.4
61.1
0.848
27
65.3
58.3
0.833
30
62.8
55.4
0.826
1 LNA: output full scale = 4.4 V p-p differential.
2 Filter: loss ≈ 1 dB, NBW = 16.67 MHz, GAIN = 0.8 V.
3 ADC: 50 MSPS, 73 dB SNR, 2 V p-p full-scale input.
4 Output dynamic range at minimum VGA gain (VGA dominated).
5 Output dynamic range at maximum VGA gain (LNA dominated).
6 Channel noise at maximum VGA gain.
Table 10 demonstrates the sensitivity and dynamic range
trade-offs that can be achieved relative to various LNA and
VGA gain settings.
For example, when the VGA is set for the minimum gain voltage,
the TGC path is dominated by VGA noise and achieves the
maximum output SNR. However, as the postamp gain options
are increased, the input-referred noise is reduced and the SNR
is degraded.
If the VGA is set for the maximum gain voltage, the TGC path
is dominated by LNA noise and achieves the lowest input-
referred noise, but with degraded output SNR. The higher the
TGC (LNA + VGA) gain, the lower the output SNR. As the
postamp gain is increased, the input-referred noise is reduced.
At low gains, the VGA should limit the system noise performance
(SNR); at high gains, the noise is defined by the source and the
LNA. The maximum voltage swing is bound by the full-scale
peak-to-peak ADC input voltage (2 V p-p).
Both the LNA and VGA have full-scale limitations within each
section of the TGC path. These limitations are dependent on the
gain setting of each function block and on the voltage applied to
the GAIN+ and GAIN pins. The LNA has three limitations,
or full-scale settings, that can be applied through the SPI.
Similarly, the VGA has four postamp gain settings that can be
applied through the SPI. The voltage applied to the GAIN± pins
determines which amplifier (the LNA or VGA) saturates first.
The maximum signal input level that can be applied as a
function of voltage on the GAIN± pins for the selectable gain
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
GAIN+ (V)
IN
P
U
T
F
U
LL
-S
C
A
L
E
(
V
p-p)
08
18
1-
0
50
PGA GAIN = 21dB
PGA GAIN = 24dB
PGA GAIN = 27dB
PGA GAIN = 30dB
Figure 56. LNA with 15.6 dB Gain Setting/VGA Full-Scale Limitations
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