pca9691 NXP Semiconductors, pca9691 Datasheet - Page 20

• Manufacturer Part Number: pca9691
• Description: 8-bit A/d And D/a Converter
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
PCA9691_1
Product data sheet
Table 9.
V
C
[1]
Inputs must be connected to V
connected to pins AGND or VREF.
In order to prevent excessive ground and supply noise and to minimize crosstalk of the
digital-to-analog signal paths the printed-circuit board layout must be designed very
carefully. Noisy digital circuits and ground loops must be avoided on the supply lines
common to the PCA9691 device. Decoupling capacitors (> 10 F) are recommended for
power supply and reference voltage inputs.
During data transfer the first bit written out is the MSB and the last bit is the LSB.
Symbol
Analog inputs
V
I
C
C
V
V
Accuracy
E
E
E
CMRR
t
f
LI
c(ADC)
c(ADC)
DD
L
sup(n)
AIN
i(se)
i(dif)
G
O
L
i(a)
i(dif)
= 50 pF; unless otherwise specified.
The linearity error is assured if the internal frequency is changed by setting bit 7 and bit 3 of the control byte
to logic 1 (see
= 5.0 V; V
Parameter
voltage on pin AIN
input leakage current
analog input capacitance
differential input capacitance
single-ended input voltage measuring range
differential input voltage
gain error
offset error
linearity error
common-mode rejection ratio
noise suppression
ADC conversion time
ADC conversion frequency f
A/D characteristics
SS
= 0 V; V
Figure
5).
VREF
Rev. 01 — 8 April 2008
= 5.0 V; V
SS
or V
Conditions
pins AIN0 to AIN3
measuring range:
V
f
f
f
f
f = 100 Hz;
V
SCL
SCL
SCL
SCL
SCL
AGND
FS
n(VDD)(p-p)
DD
= V
> 400 kHz
> 400 kHz
= 1 MHz
when not in use. Analog inputs may also be
= 0 V; T
400 kHz
400 kHz
VREF
= 100 mV
amb
V
AGND
= 40 C to +85 C; R
[1]
[1]
Min
V
-
-
V
-
-
-
-
-
-
-
-
-
8-bit A/D and D/A converter
100
0.5V
SS
AGND
FS
Typ Max
-
-
10
10
-
-
-
-
-
-
-
40
40
-
-
PCA9691
© NXP B.V. 2008. All rights reserved.
L
= 10 k ;
V
+100
-
-
V
+0.5V
1
3
-
-
8.5
111
20
1.0
2.0
DD
VREF
FS
20 of 28
Unit
V
nA
pF
pF
V
V
%
%
mV
LSB
LSB
dB
dB
kHz
s