Rainbow Electronics DS1680 - Manual (Page 19)

DS1680
19 of 23
ADC CHARACTERISTICS (0
°
C to +70
°
C; V
CC
, V
AVD
= 3.3V
±
10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Resistance of Digitizer Film R
D
250 600 1000
Ω
Resistance of On-Chip Driver R
DRIVER
15 30
Ω
Parasitic Capacitance Between X-
and Y-Plates of Digitizer
C
XY
5 10 nF
Ladder Resistance R
REF
8 25 60 k
Ω
ADC Active Current I
AVDA
320 450
µ
A 5
ADC Standby Current I
AVDS
50 150
µ
A 6
Reference Current I
REF
150 550
µ
A
Input Leakage (AIN0, AIN1) I
LI
10 nA
Analog Input Capacitance C
IN
10 15 pF
Resolution 10 Bits
Differential Nonlinearity E
DL
±
0.5
±
1.0 LSB
Integral Nonlinearity E
IL
±
0.5
±
1.0 LSB
Offset Error E
OS
±
1.0
±
1.5 LSB
Gain Error E
G
±
0.25
±
1.0 %
ADC Clock Frequency F
OSCIN
2.5 MHz
Multiplexer Selector Path
Propagation Delay
t
MUX
120 ns
COEN Falling Edge to Data Bus
Driven
t
OEA
80 ns
COEN Rising Edge to Data Bus
High-Z
t
OEZ
80 ns
POWER-FAIL AND RESET CHARACTERISTICS
(0
°
C to +70
°
C; V
CC
= 5.0V
±
10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
PFI Low to PFO Low t
PFD
100 ns
PFI High to PFO High t
PFU
100 ns
V
CC
Detect to RST (V
CC
Falling) t
RPD
100 ns
V
CC
Detect to RST (V
CC
Rising) t
RPU
250 ms 15,16
Reset Active Time t
RST
250 ms 15
Pushbutton Debounce PB
DB
250 ms 15
ST Pulse Width t
ST
20 ns
Chip-Enable Propagation Delay to
External SRAM t
CED
8 15 ns
V
CCTP(MAX)
to V
CCSW(MIN)
Fall Time t
FB
200 µs 20