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參數(shù)資料
| 型號： | LTC1750IFW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 80MSPS SMPL 48TSSOP |
| 標(biāo)準(zhǔn)包裝： | 39 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 80M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 1.69W |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-TFSOP（0.240"，6.10mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 48-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，雙極；1 個差分，雙極 |
13
LTC1750
1750f
Input Drive Circuits
The LTC1750 requires differential drive for the analog
inputs. A balanced input drive will minimize even order
harmonics that are due to nonlinear behavior of the input
drive circuits and the S/H circuit.
The S/H circuit of the LTC1750 is a switched capacitor
circuit (Figure 2). The input drive circuitry will see a
sampling glitch at the start of the sampling period, when
ENC/ENC falls. Although designed to be linear as possible,
a small fraction of this glitch is nonlinear and can result in
additional observed distortion if the input drive circuitry is
too slow. For most practical circuits the glitch nonlinearity
is more than 100dB below the fundamental. The glitch will
decay during the sampling period with a time constant
determined by the input drive and S/H circuitry.
For fast settling and wide bandwidth, a low drive imped-
ance is required. The S/H bandwidth is partially deter-
mined by the source impedance. The full 500MHz
bandwidth is valid for source impedance (each input) less
than 30
. Higher source impedance can be used but full
amplitude distortion will be better with source impedance
less than 100
.
Transformers
Transformers provide a simple method for converting a
single-ended signal to a differential signal; however, they
have poor performance characteristics at low and high input
frequencies. The lower –3dB corner of RF transformers can
range from tens of kHz to tens of MHz. Operation near this
corner results in poor 2nd order harmonic performance
due to nonlinear transformer core behavior. The upper
–3dB corner can vary from tens of MHz to several GHz.
Operation near the upper corner can result in poor 2nd order
performance due to poor balance on the secondary.
Transformers should be selected to have –3dB corners at
least one octave away from the desired operating fre-
quency. Transformers with larger cores usually have
better performance at lower frequency and perform better
when driving heavy loads.
Figure 3a shows the LTC1750 being driven by an RF
transformer with a center tapped secondary. The second-
ary center tap is DC-biased with VCM, setting the ADC input
signal at its optimum DC level of 2V. In this example a 1:1
transformer is used; however, other transformer imped-
ance ratios may be substituted.
Figure 3b shows the use of a transformer without a center
tapped secondary. In this example the secondary is biased
with the addition of two resistors placed in series across
the secondary winding. The center tap of the secondary
resistors is connected to the ADC VCM output to set the DC
bias. This circuit is better suited for high input frequency
applications since center tapped transformers generally
have less bandwidth and poor balance at high frequencies
than noncenter tapped transformers.
APPLICATIO S I FOR ATIO
WU
UU
Figure 3a. Single-Ended to Differential
Conversion Using a Transformer
1:1
25
0.1
F
ANALOG
INPUT
100
100
12pF
1750 F03
4.7
F
25
25
25
LTC1750
VCM
AIN
+
AIN
–
1:4
10
0.1
F
ANALOG
INPUT
100
200
200
8.4pF
1750 F03b
10
25
25
8.4pF
4.7
F
LTC1750
VCM
AIN
+
AIN
–
Figure 3b. Using a Transformer
Without a Center Tapped Secondary
Active Drive Circuits
Active circuits, open loop or closed loop, can be used to
drive the ADC inputs. Closed-loop circuits such as op amps
have excellent DC and low frequency accuracy, but have
poor high frequency performance. Figure 4 shows the dual
LT
1818 op amp used for single-ended to differential
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