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| 型号： | TLV1562IDWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 4-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | 1.27 MM PITCH, GREEN, SOIC-28 |
| 文件页数： | 41/41页 |
| 文件大小： | 600K |
| 代理商： | TLV1562IDWR |
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TLV1562
2.7 V TO 5.5 V, HIGH-SPEED LOW-POWER RECONFIGURABLE ANALOG-TO-DIGITAL
CONVERTER WITH 4-INPUT, DUAL S/H, PARALLEL INTERFACE, AND POWER DOWN
SLAS162 – SEPTEMBER 1998
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
equivalent input impedance
VCC (V)
Ron(
)
1 k
0.5 k
2.7
5.5
Vin
Cpad = 10 pF
0 V
Csample = 0.5 pF
FB
Rs
Ron
Buffer
Figure 4. Equivalent Input Circuit
Figure 5. Input Mux On Resistance vs
Analog Supply Voltage
Req = Vin/Ieq = (Q/Cin)/(Q/T) = T/Cin = 1/(fs
× Csample) = 1/(2 MHz × 0.5 pF) = 1 M
Where fs is the sampling frequency, and fc is the conversion frequency
fs = fc/5
when the device is in one channel/continuous conversion mode,
fs = fc/10
when the device is in one channel/continuous conversion mode,
fs = Conversion trigger strobe frequency when the device is in interrupt mode (RD or CSTART)
Csample = Input capacitance = 0.5 pF
Cparasitic = Parasitic capacitance = 0.5 pF
Cpad = Input PAD capacitance = 10 pF
Ron = Mux switch on series resistance = 1 k
at 2.7 V
Rs = Source output resistance = 1 k
input bandwidth (full power 0 dB input, BW at –1 dB)
BW = 1/[2
× π × (Rtotal y Cac)]
= 1/[2
× π × ((Ron + Rs) × (Csample + Cparasitic))]
= 1/[2
× π × (2K × 1 pF)]
= 79.6 MHz
(Theoretical Max)
–3
–4
–5
10
20
40
50
70
90
100
Attenuation
in
dB
–2
–1
Analog Input Frequency – MHz
0
120
130
150
30
60
80
110
140
Figure 6. Typical Analog Input Frequency Input Bandwidth
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