AKM Confidential
AK2571
E_DAC2_GAIN
[1:0]
Gain Minimum
output
current
(Design target)
Maximum
output current
(Design target)
Resolution
(Design target)
Remarks
00 1
0mA
21.42mA
0.084mA/step Default
01 1/2
10.71mA
0.042mA/step
10 1/4
0mA 5.36mA
0.021mA/step
Parameter Condition
Min
Typ
Max
Unite
Remarks
Resolution
10
E_DAC3_GAIN
0mA
(14) IDAC4 characteristics
bit
Maximum output current
45.58
50.64
55.70
mA
±
10% *1)
Minimum output current
3.2
mA *2)
Step
(=1LSB)
0.050
mA/step
*3)
Output voltage
1.8
V
*4)
DNL
+2
LSB
Input digital code
D[9:0] 3FF - 000 (straight binary)
*1) Current at maximum setting (3FF)h .
Linearity from (00)h to (40)h is not guaranteed. However (00)h setting, will set an internal switch and force the
output to 0V.
*3) output current ”Iidac4” as indicated by the expression below, if DAC4 setting code is ”K”.
Iidac4= (50.64 / 255 ) * K [mA]
*4) Construct an external circuit to ensure that the IOUT4 voltage does not exceed this value. If this value is exceeded,
output current cannot be guaranteed and .APC operation may not function properly.
(15) Shut down characteristics
Parameter Conditions
typ
max
Unite
Remark
SHUTDOWN setup time Time
from
SHUT_APCN/SHUT_ATCN = “L”
to output of IDACx(1,2,3) become
Hi-Z and IDAC4 becomes OFF.
10
SHUTDOWN release time Time from SHUT_APCN = “H” to
IDACx(1,2,3) output settled
current.
500
μ
s Only for
SHUT_
APCN
*1) SHUT DOWN release time is regulated in SHUT_APCN.
(16) T_V conversion characteristics
Parameter Condition
min
typ
max
Remark
T_V Conv. gain
Offset adjustment
-0.7
°
C/step
Design
target
Regulated by the digital data after A-to-D conversion. Its offset is adjusted by AKM in testing.
-2
*2) current of minimum setting (20)h.
min
μ
s
*1)
Unite
±
5%
<Rev. 0.6E Preliminary> -48-
2001/11
