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參數(shù)資料
| 型號： | XRD8799EVAL |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 2/24頁 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XRD8799 |
| 產品變化通告： | Obsolescence Notification 15/Apr/2010 |
| 標準包裝： | 1 |
| 系列： | * |
xr
xr
XRD8799
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
REV. 1.00
10
FIGURE 5. XRD8799 COMPARATORS
1.1
ACCURACY OF CONVERSION: DNL AND INL
The transfer function for an ideal A/D converter is
shown in Figure 6.
FIGURE 6. IDEAL A/D TRANSFER FUNCTION
The overflow transition (VOFW) takes place at:
VIN = VOFW = VREF(+)
The first and the last transitions for the data bits take
place at:
VIN = V001 = VREF(-) + 1.0 * LSB
VIN = V3FF = VREF(-) - 1.0 * LSB
VREF = VREF(+) - VREF(-)
LSB = VREF / 1024 = (V3FF - V001) / 1022
NOTE: The overflow transition is a flag and has no impact
on the data bits.
In a "real" converter the code-to-code transitions don't
fall exactly every VREF/1024 volts.
A positive DNL (Differential Non-Linearity) error
means that the real width of a particular code is larger
than 1 LSB. This error is measured in fractions of
LSBs.
A Max DNL specification guarantees that ALL code
widths (DNL errors) are within the stated value. A
specification of Max DNL = + 0.5 LSB means that all
code widths are within 0.5 and 1.5 LSB. If VREF =
4.608 V then 1 LSB = 4.5 mV and every code width is
within 2.25 and 6.75 mV.
Settle by Clock Update Time
Reference Stable Time - For Sample A
IN1
Sample A IN1
Reference Stable Time - For Sample A
IN2
Hold Reference Value Past
Clock Change for t
AP Time
Short Cycle Sample will be discarded
Sample A IN2
AINX1
Not Used
A
INX0
Sample A
IN1
Sample A
IN2
Sample Ladder
for A
IN1
Sample Ladder
for A
INX1
Sample Ladder
for
AIN2
Sample Ladder
for A
INX2
Compare Ladder
V/S A
INX0
Compare Ladder
V/S A
IN1
Compare Ladder
V/S A
INX1
Compare Ladder
V/S A
IN2
DATA A
IN0
DATA A
INX0
DATA A
IN1
DATA A
INX1
Not Used
DATA
Ladder Compare
(LSB Bank)
Ladder Sample
Window (MSB Bank)
AIN Sample
Window
Clock
Update
References
External
Internal
External
t
S
ΦB
ΦS
ΦB
ΦS
A
INX1
3FF
3FE
3FD
V
REF(-)
V
REF(+)
DIGITAL
CODES
000
002
LSB
OFW=0
V
001
OFW=1
1 LSB
V001
V002
V
3FE
V
3FF
V
0FW =
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