ADC10040_14 Datasheet, PDF (20/28 Pages) Texas Instruments – ADC10040/ADC10040Q 10-Bit, 40 MSPS, 3V, 55.5 mW A/D Converter

ADC10040
SNAS224M – JULY 2003 – REVISED APRIL 2013
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D.C. Applications
For very low frequency and DC input applications, a d.c. coupled amplifier or buffer may be needed, especially
when the input is single-ended and the advantages of a differential input signal is desired. Figure 41 shows the
input drive circuit that can be used to replace the transformer of Figure 40. The LMH6550 provides excellent
performance and is well-suited for this application. The common mode output voltage of the LMH6550 is the
same as its VCM input.
R_F
R_G
-
V_CM
+
R_T
16:
LMH6550
24 pF
ADC
Input
50:
R_G
R_T
50:
16:
R_F
From
ADC
V_COM
Figure 41. Using the LMH6550 for DC and wideband applications
Single Ended Applications
Performance of the ADC10040 with a single-ended input is not as good as its performance with a differential
input. However, if the lower performance is adequate, the circuit of Figure 42 shows an acceptable method of
driving the analog input.
V_DDIO
V_DDA
4.7 PF
0.1 PF
CLKIN
0.1 PF
16:
AIN
51 pF
5
IRS
1
CLK
12
V_IN-
4
VCOM
13
V_IN+
0.1 PF
0.1 PF
0.1 PF
6
7 ^VREF
8
V_REFT
V_REFB
V_DDIO
0.1 PF
D0 ²⁷
D1 ²⁶
D2 ²⁵
D3 ²⁴
D4 ²³
D5 ²⁰
D6 ¹⁹
D7 ¹⁸
D8 ¹⁷
D9 ¹⁶
4.7 PF
CLKIN
15
DF
STBY ²⁸
1
24 ^{4 OE}
3 OE
25 _{2 OE}
48
1 OE
26
27 _4A3
29 _4A2
30 _4A1
32
3A4
33
3A3
35 _3A2
36 _3A1
37 _2A4
38
2A3
40
2A2
41 _2A1
43 _1A4
44 _1A3
46 _1A2
47 _1A1
V_CC ⁷
V_CC ¹⁸
V_CC ³¹
V_CC ⁴²
4Y4 ²³
4Y3 ²²
4Y2 ²⁰
4Y1 ¹⁹
3Y4 ¹⁷
3Y3 ¹⁶
3Y2 ¹⁴
3Y1 ¹³
CLKOUT
D0
D1
2Y4 ^{12 D2}
2Y3 ^{11 D3}
2Y2 ^{9 D4}
2Y1 ^{8 D5}
1Y4 ^{6 D6}
1Y3 ^{5 D7}
1Y2 ^{3 D8}
1Y1 ^{2 D9}
Figure 42. A Simple Application Using a Single Ended Signal Source
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