XRD8799AIQ Exar Corporation, XRD8799AIQ Datasheet - Page 10

• Manufacturer Part Number: XRD8799AIQ
• Description: IC ADC 10BIT 2MSPS 44PQFP
• Manufacturer: Exar Corporation

Specifications of XRD8799AIQ

• Number Of Bits: 10
• Sampling Rate (per Second): 2M
• Data Interface: Parallel
• Number Of Converters: 8
• Power Dissipation (max): 450mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-BQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

xr
xr
F
The transfer function for an ideal A/D converter is
shown in Figure 6.
F
1.1 A
IGURE
IGURE
DIGITAL
V
CODES
REF(-)
Window (MSB Bank)
000
Ladder Compare
Ladder Sample
5. XRD8799 C
CCURACY OF
6. I
V001
AIN Sample
References
(LSB Bank)
001
External
External
Internal
1 LSB
LSB
Window
DATA
Clock
Update
DEAL
V002
A/D T
002
C
ONVERSION
A
OMPARATORS
IN
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
RANSFER
X0
3FD
V
Compare Ladder
Sample Ladder
3FE
Settle by Clock Update Time
V/S A
for A
3FE
IN
OFW=0
B
IN1
F
: DNL
X0
V
UNCTION
DATA A
3FF
Sample A IN1
Reference Stable Time - For Sample A
3FF
IN0
AND
Sample A
V
0FW
OFW=1
=
INL
S
IN1
V
REF(+)
Short Cycle Sample will be discarded
V
Compare Ladder
Sample Ladder
10
for A
V/S A
DATA A
Not Used
IN1
IN
B
The overflow transition (VOFW) takes place at:
The first and the last transitions for the data bits take
place at:
N
on the data bits.
In a "real" converter the code-to-code transitions don't
fall exactly every V
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 V
4.608 V then 1 LSB = 4.5 mV and every code width is
within 2.25 and 6.75 mV.
X1
IN1
Not Used
OTE
AINX1
V
V
V
LSB = V
IN
t
V
S
X0
IN
IN
REF
IN
: The overflow transition is a flag and has no impact
A
= V3FF = V
= V001 = V
= VOFW = V
IN
X1
S
= V
REF
REF(+)
Compare Ladder
Sample Ladder
V/S A
for
/ 1024 = (V
B
AIN2
IN
X1
- V
REF(-)
REF(-)
DATA A
REF
REF(+)
Sample A IN2
REF(-)
Reference Stable Time - For Sample A
/1024 volts.
IN1
+ 1.0 * LSB
- 1.0 * LSB
Sample A
3FF
S
IN2
- V001) / 1022
Compare Ladder
Sample Ladder
Hold Reference Value Past
Clock Change for t
V/S A
for A
DATA A
Not Used
IN2
IN
IN2
X2
XRD8799
IN
X1
REV. 1.00
REF
AP
Time
=