AMIC110 Datasheet, PDF (97/214 Pages) Texas Instruments – Sitara Processors

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AMIC110
SPRS971A – AUGUST 2016 – REVISED SEPTEMBER 2016
AMIC110
XTALIN
VSS_OSC
C₁
C₂
Crystal
XTALOUT
Optional R_d
Optional R_bias
Copyright © 2016, Texas Instruments Incorporated
A. Oscillator components (Crystal, C₁, C₂, optional R_bias and R_d) must be located close to the AMIC110 package.
Parasitic capacitance to the VSS_OSC and respective crystal circuit component grounds should be connected directly
to the nearest PCB digital ground (VSS).
B. C₁ and C₂ represent the total capacitance of the respective PCB trace, load capacitor, and other components
(excluding the crystal) connected to each crystal terminal. The value of capacitors C₁ and C₂ should be selected to
provide the total load capacitance, C_L, specified by the crystal manufacturer. The total load capacitance is C_L = [(C₁ ×
C₂) / (C₁ + C₂)] + C_shunt, where C_shunt is the crystal shunt capacitance (C₀) specified by the crystal manufacturer plus
any mutual capacitance (C_pkg + C_PCB) seen across the AMIC110 XTALIN and XTALOUT signals. For recommended
values of crystal circuit components, see Table 6-2.
Figure 6-9. OSC0 Crystal Circuit Schematic
Table 6-2. OSC0 Crystal Circuit Requirements
PARAMETER
Crystal parallel resonance
frequency
ƒ_xtal
Crystal frequency stability
and tolerance⁽¹⁾
C_C1
C₁ capacitance
C_C2
C_shunt
C₂ capacitance
Shunt capacitance
ESR
Crystal effective series
resistance
Fundamental mode oscillation only
C_shunt ≤ 5 pF
C_shunt > 5 pF
C_shunt ≤ 5 pF
C_shunt > 5 pF
ƒ_xtal = 19.2 MHz, oscillator has nominal
negative resistance of 272 Ω and worst-
case negative resistance of 163 Ω
ƒ_xtal = 24 MHz, oscillator has nominal
negative resistance of 240 Ω and worst-
case negative resistance of 144 Ω
ƒ_xtal = 25 MHz, oscillator has nominal
negative resistance of 233 Ω and worst-
case negative resistance of 140 Ω
ƒ_xtal = 26 MHz, oscillator has nominal
negative resistance of 227 Ω and worst-
case negative resistance of 137 Ω
MIN
TYP
19.2, 24,
25, or 26
–50
12
18
12
18
MAX UNIT
MHz
50 ppm
24
pF
24
24
pF
24
7 pF
54.4
48.0
Ω
46.6
45.3
(1) Initial accuracy, temperature drift, and aging effects should be combined when evaluating a reference clock for this requirement.
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