71M6521DE Datasheet, PDF (93/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
CRYSTAL OSCILLATOR
PARAMETER
Maximum Output Power to Crystal
XIN to XOUT Capacitance
Capacitance to DGND
XIN
XOUT
CONDITION
Crystal connected
MIN
TYP
MAX UNIT
1
μW
3
pF
5
pF
5
pF
VREF, VBIAS
Unless otherwise specified, VREF_DIS=0
PARAMETER
CONDITION
MIN TYP MAX
VREF output voltage, VNOM(25)
Ta = 22ºC
1.193 1.195 1.197
VREF chop step
50
VREF output impedance
VREF_CAL =1,
ILOAD = 10 µA, -10 µA
2.5
VNOM definition²
VNOM (T ) = VREF (22) + (T − 22)TC1+ (T − 22) ² TC2
UNIT
V
mV
kΩ
V
-- If TRIMBGA and TRIMBGB not available --
VREF temperature coefficients
TC1
+7.0
TC2
-0.341
VREF(T) deviation from VNOM(T)
VREF(T ) − VNOM (T )
10 ⁶
Ta = -40ºC to +85ºC
-40¹
VNOM (T )
max(T − 22 ,40)
+40¹
-- If TRIMBGA and TRIMBGB are available (71M6521DH) --
Define the following variables:
𝑇𝐸𝑀𝑃_22,1 ≡ 𝑇𝐸𝑀𝑃_𝑅𝐴𝑊_𝑋/2¹⁰ --where TEMP_RAW_X is measured with FIRLEN=1
𝑇𝐸𝑀𝑃_22,0
=
𝑇𝐸𝑀𝑃_22,1
2.3704
--this calculates the value of TEMP₂₂ if measured with FIRLEN=0
𝛾 = 0.1 ∙ 𝑇𝑅𝐼𝑀𝐵𝐺𝐵 − 0.143 ∙ (𝑇𝑅𝐼𝑀𝑀 + 0.5)
𝜉
=
𝑇𝐸𝑀𝑃_22,0
−
(500
∙ 𝑇𝑅𝐼𝑀𝐵𝐺𝐴
900
+
370000)
𝜂 = (56.2 − 𝑇𝑅𝐼𝑀𝑇) ∙ 0.55
VNOM temperature coefficients
(Δv and ΔT are defined in the
section entitled “Voltage Refer-
ence”)
TC1
𝜂 + 19𝛾 − 0.065𝛾𝜉 + 0.34𝜉 + 8.0
TC2
0.015𝛾 − 0.0013𝜉 − 0.35
µV/ºC
µV/°C²
ppm/ºC
μV/ºC
μV/ºC²
VREF(T) deviation from VNOM(T)
VREF(T ) − VNOM (T )
10 ⁶
Ta = -40ºC to +85ºC
-20¹
VNOM (T )
max(T − 22 ,40)
+20¹
ppm/ºC
VREF aging
VBIAS voltage
Ta = 25ºC
Ta = -40ºC to 85ºC
±25
(-1%) 1.6
(-4%)¹ 1.6¹
1_{Guaranteed by design; not production tested.}
2 _{This relationship describes the nominal behavior of VREF at different temperatures.}
(+1%)
(+4%)¹
ppm/ year
V
V
Rev 2
Page: 93 of 107