22 ELECTRICAL CHARACTERISTICS
22-14
Seiko Epson Corporation
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)
SDAn
SCLn
S
t
f
t
BUF
t
HD:STA
1/f
SCL
1st clock cycle
t
f
9th clock cycle
S: START condition
Sr: Repeated START condition
P: STOP condition
t
r
t
HD:DAT
t
HIGH
t
SU:STA
t
LOW
t
r
t
SU:DAT
Sr
P
S
t
HD:STA
t
SU:STO
22.13 12-bit A/D Converter (ADC12A) Characteristics
Unless otherwise specified: V
DD
= 2.5 to 5.5 V, VREFAn = 1.8 to 5.5 V, V
SS
= 0 V, Ta = -40 to 85
°
C,
ADC12A_nTRG.SMPCLK[2:0] bits = 0x3 (7cycles)
Item
Symbol
Condition
V
DD
Min.
Typ.
Max. Unit
VREFAn voltage range
V
REFA
1.8
–
V
DD
V
A/D conversion clock
frequency
f
CLK_ADC12A
16
–
2,200 kHz
Sampling rate
*
1
f
SMP
–
–
100
ksps
Integral nonlinearity
*
2
INL
V
DD
= VREFAn
*
3
–
–
±
3
LSB
Differential nonlinearity
DNL
V
DD
= VREFAn
*
3
–
–
±
3
LSB
Zero-scale error
ZSE
V
DD
= VREFAn
*
3
–
–
±
5
LSB
Full-scale error
FSE
V
DD
= VREFAn
*
3
–
–
±
5
LSB
Analog input resistance
R
ADIN
–
–
4
k
W
Analog input capacitance C
ADIN
–
–
30
pF
A/D converter circuit
current
I
ADC
ADC12A_nCFG.VRANGE[1:0] bits = 0x3,
V
DD
= V
REFA
, ADIN = V
REFA
/2, f
SMP
= 100 ksps,
Ta = 25
°
C
3.6 V
–
400
700
µA
ADC12A_nCFG.VRANGE[1:0] bits = 0x2,
V
DD
= V
REFA
, ADIN = V
REFA
/2, f
SMP
= 100 ksps,
Ta = 25
°
C
4.8 V
–
230
470
µA
ADC12A_nCFG.VRANGE[1:0] bits = 0x1,
V
DD
= V
REFA
, ADIN = V
REFA
/2, f
SMP
= 100 ksps,
Ta = 25
°
C
5.5 V
–
210
390
µA
*
1 The Max. value is the value when the A/D conversion clock frequency f
CLK_ADC12A
= 2,000 kHz.
*
2 Integral nonlinearity is measured at the end point line.
*
3 The error will be increased according to the potential difference between V
DD
and VREFAn.
A/D converter current consumption-power supply voltage characteristic
V
DD
= V
REFA
, ADIN = V
REFA
/2, f
SMP
= 100 ksps, Ta = 25
°
C, Typ. value
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
1,100
1,000
900
800
700
600
500
400
300
200
100
0
V
DD
= V
REFA
[
V
]
I
ADC
[
µ
A]
0x3
0x2
0x1
ADC12A_nCFG.VRANGE[1:0] bits =