71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
ADC CONVERTER, V3P3A REFERENCED
FIR_LEN=0, VREF_DIS=0, LSB values do not include the 9-bit left shift at CE input.
PARAMETER
Recommended Input Range
(Vin-V3P3A)
CONDITION
MIN
TYP
MAX
UNIT
mV
peak
-250
250
Voltage to Current Crosstalk:
Vin = 200mV peak, 65Hz,
on VA
106 *Vcrosstalk
-10
40
10
μV/V
cos(∠Vin − ∠Vcrosstalk)
Vcrosstalk = largest
measurement on IA or IB
Vin
THD (First 10 harmonics)
250mV-pk
20mV-pk
Input Impedance
Temperature coefficient of Input
Impedance
Vin=65Hz,
64kpts FFT, Blackman-
Harris window
Vin=65Hz
-75
-90
90
dB
dB
kΩ
Vin=65Hz
1.7
Ω/°C
nV/LSB
LSB
FIR_LEN=0
FIR_LEN=1
FIR_LEN=0
FIR_LEN=1
357
151
+884736
LSB size
Digital Full Scale
±2097152
ADC Gain Error vs
%Power Supply Variation
Vin=200mV pk, 65Hz
V3P3A=3.0V, 3.6V
106 ΔNoutPK 357nV /VIN
100ΔV3P3A/3.3
50
10
ppm/%
mV
Input Offset (Vin-V3P3A)
-10
OPTICAL INTERFACE
PARAMETER
OPT_TX VOH (V3P3D-OPT_TX)
OPT_TX VOL
CONDITION
ISOURCE=1mA
ISINK=20mA
MIN
TYP
MAX
0.4
0.7
UNIT
V
V
TEMPERATURE SENSOR
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
Nominal Sensitivity (Sn) †
-2180
LSB/ºC
TA=25ºC, TA=75ºC,
FIR_LEN = 1
Nominal relationship:
N(T)= Sn*(T-Tn)+Nn
Nominal (Nn) † †
1.0
106 LSB
Temperature Error†
TA = -40ºC to +85ºC
Tn = 25°C
⎛
⎞
(N(T) − Nn )
-10
+10
ºC
⎜
⎜
⎟
⎟
ERR = T −
+Tn
Sn
⎝
⎠
† LSB values do not include the 9-bit left shift at CE input.
†† Nn is measured at Tn during meter calibration and is stored in MPU or CE for use in temperature calculations.
v1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
Page: 91 of 101
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