Datasheet

71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
NOVEMBER 2010
Page: 88 of 98 © 2005–2010 Teridian Semiconductor Corporation V2.7
A Maxim Integrated Products Brand
VREF, VBIAS
Unless otherwise specified, VREF_DIS=0
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
VREF output voltage, VNOM(25)
Ta = 22ºC
1.193
1.195
1.197
V
VREF chop step
40
mV
VREF output impedance
VREF_CAL = 1,
I
LOAD
= 10µA, -10µA
2.5 kΩ
VNOM definition
A
VNOM(T)
= VREF(22) + (T–22)TC1 + (T–22)
2
TC2
V
-- If TRIMBGA and TRIMBGB available (6511H) --
VREF temperature coefficients
TC1 (linear)
TC2 (quadratic)
TRIMBGA, TRIMBGB, TRIMM[2:0]: See
TRIMSEL, TRIM registers
x(33-0.28y) + 0.33y + 7.9
x(0.02-0.0002y) – 0.46
where x = 0.1TRIMBGB - 0.14(TRIMM[2:0]+0.5),
900
370000_500
7404.4
_
−−
=
BGATRIM
NOMTEMP
y
µV/°C
µV/°C
2
VREF(T) deviation from VNOM(T)
)40|,22max(|
10)()(
6
−
−
TVNOM
TVNOMTVREF
-10 10 ppm/ºC
-- If TRIMBGA and TRIMBGB not available (6511) --
VREF temperature coefficients
TC1 (linear)
TC2 (quadratic)
7.0
-0.341
µV/ºC
µV/°C
2
VREF(T) deviation from VNOM(T)
)40|,22max(|
10)()(
6
−
−
TVNOM
TVNOMTVREF
Ta = -40ºC to +85ºC -40
1
+40
1
ppm/ºC
VREF aging Ta = 25ºC
±25
ppm/
year
VBIAS output voltage
Ta = 25ºC
Ta = -40ºC to 85ºC
(-1%)
(-2%)
1
1.5
1.5
1
(+1%)
(+2%)
1
V
V
VBIAS output impedance
I
LOAD
= 1mA, -1mA
240
500
Ω
1
Guaranteed by design, not subject to test.
A
This relationship describes the nominal behavior of VREF at different temperatures.
CRYSTAL OSCILLATOR
Crystal is disconnected. Test load is series 200pF, 100kΩ connected between DGND and XOUT.
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
Maximum Output Power to Crystal
4
Crystal connected
1
μW
XIN to XOUT Capacitance
3
pF
Capacitance to DGND
XIN
XOUT
5
5
pF
pF
Watchdog RTC_OK threshold
25
kHz