wm9712l Wolfson Microelectronics plc, wm9712l Datasheet - Page 9

• Manufacturer Part Number: wm9712l
• Description: Ac?97 Audio And Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

Production Data
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TOUCHPANEL AND AUXILIARY ADC
Note:
1. Current only flows into pin 31 during a measurement. At all other times, BMON/AUX3 is effectively an open circuit.
COMPARATORS
Test Conditions
DBVDD=3.3V, DCVDD = 3.3V, AVDD = TPVDD = 3.3V, T
Input Pins X+, X-, Y+, Y-, WIPER/AUX4, COMP1/AUX1, COMP2/AUX2 and BMON/AUX3
Input Voltage
Input leakage current
ADC Resolution
Differential Non-Linearity Error
Integral Non-Linearity Error
Offset Error
Gain Error
Power Supply Rejection
Throughput Rate
Settling Time (programmable)
Conversion Time
Switch matrix resistance
Programmable Pull-up resistor
Pen down detector threshold
Pressure measurement current
BMON/AUX3 (pin 31 only)
Input Range
Scaling
Input Resistance (Note 1)
Test Conditions
AVDD = 3.3V, T
COMP1/AUX1 and COMP2/AUX2 (pins 29, 30)
Input Voltage
Input leakage current
Comparator Input Offset
(COMP1, COMP2 only)
COMP2 delay (COMP2 only)
PARAMETER
PARAMETER
A
= +25
o
C, unless otherwise stated.
DNL
INL
R
I
PSRR
SYMBOL
SYMBOL
P
PU
AUX pin not selected as
pin not selected as AUX
measurements require
Note: touch pressure
during measurement
MCLK = 24.576MHz
TEST CONDITIONS
TEST CONDITIONS
(zero settling time)
24.576MHz crystal
average over time
two conversions
AUX ADC input
RPU = 000001
AVDD = 3.3V
AVDD = 1.8V
DEL = 1111
ADC input
PIL = 1
PIL = 0
A
= +25
o
C, MCLK = 24.576 MHz, unless otherwise stated.
AGND
AGND
AGND
AGND
-3%
MIN
MIN
-50
55
0
0
duty cycle
VDD/2
±0.25
20.8
TYP
<10
400
200
30 /
TYP
<10
1/3
12
50
12
63
30
PD Rev 4.5 August 2006
AVDD
AVDD
MAX
+3%
MAX
10.9
+50
3.3
±1
±2
±4
±6
48
70
6
5
WM9712L
UNIT
UNIT
LSB
LSB
LSB
LSB
kHz
bits
mV
ms
kΩ
kΩ
nA
dB
µA
nA
µs
Ω
V
V
V
V
V
s
9