参数资料
型号: TLV1571IPWG4
厂商: TEXAS INSTRUMENTS INC
元件分类: ADC
英文描述: 1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO24
封装: GREEN, TSSOP-24
文件页数: 9/33页
文件大小: 627K
代理商: TLV1571IPWG4
TLV1571, TLV1578
2.7 V TO 5.5 V, 1-/8-CHANNEL, 10-BIT,
PARALLEL ANALOG-TO-DIGITAL CONVERTERS
SLAS170D –MARCH 1999 – REVISED JULY 2000
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simplified analog input analysis
Using the equivalent circuit in Figure 9, the time required to charge the analog input capacitance from 0 to VS
within 1/2 LSB, tch(1/2 LSB), can be derived as follows.
The capacitance charging voltage is given by:
Where:
Rt = Rs + Ri
Ri = Ri(ADC) + Ri(MUX)
tch = Charge time
V
C(t) +
V
S
1–e
–t
ch
RtCi
The input impedance Ri is 718 at 5 V, and is higher (~ 1.25 k) at 2.7 V. The final voltage to 1/2 LSB is given
by:
VC (1/2 LSB) = VS – (VS/2048)
Equating equation 1 to equation 2 and solving for cycle time tc gives:
and time to change to 1/2 LSB (minimum sampling time) is:
tch (1/2 LSB) = Rt × Ci × ln(2048)
V
S *
V
S
2048
+ V
S
1–e
–t
ch
RtCi
Where:
ln(2048) = 7.625
Therefore, with the values given, the time for the analog input signal to settle is:
tch (1/2 LSB) = (Rs + 718 ) × 15 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams, which is 6x SCLK.
tch (1/2 LSB) ≤ 6x 1/f(SCLK)
Therefore the maximum SCLK frequency is:
Max(f(SCLK)) = 6/tch (1/2 LSB) = 6/(ln(2048) × Rt × Ci)
(1)
(2)
(3)
(4)
(5)
(6)
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