from jitx import PadMapping
from jitx.circuit import Circuit
from jitx.common import Power
from jitx.component import Component
from jitx.net import Port
from jitxlib.landpatterns.generators.soic import SOIC
from jitxlib.landpatterns.ipc import DensityLevel
from jitxlib.landpatterns.leads import LeadProfile, SMDLead
from jitxlib.landpatterns.leads.protrusions import SmallGullWingLeads
from jitxlib.landpatterns.package import RectanglePackage
from jitxlib.parts import Capacitor
from jitxlib.symbols.box import BoxSymbol, Row, PinGroup, Column
from jitx.si import Toleranced
[docs]
class PAM8302AADCR(Component):
"""2.5W Filterless Class-D Mono Audio Amplifier"""
mpn = "PAM8302AADCR"
reference_designator_prefix = "U"
# Audio amplifier pins
SD = Port() # Shutdown pin (active low)
NC = Port() # No connect
IN_plus = Port() # Positive input
IN_minus = Port() # Negative input
VO_plus = Port() # Positive output
VDD = Port() # Power supply
GND = Port() # Ground
VO_minus = Port() # Negative output
landpattern = (
SOIC(num_leads=8)
.lead_profile(
LeadProfile(
span=Toleranced(6.0, 0.2), # Typical span for SO-8
pitch=1.27, # Standard 1.27mm pitch
type=SMDLead(
length=Toleranced(0.835, 0.435), # Range 0.4-1.27mm
width=Toleranced(0.41, 0.1), # Range 0.31-0.51mm
lead_type=SmallGullWingLeads,
),
)
)
.package_body(
RectanglePackage(
width=Toleranced(3.9, 0.1), # Typical body width
length=Toleranced(4.9, 0.1), # Typical body length
height=Toleranced(1.55, 0.2), # Range 1.35-1.75mm
)
)
.density_level(DensityLevel.A)
)
symbol = BoxSymbol(
rows=[
Row(left=[PinGroup([IN_plus, IN_minus])], bottom_margin=4.0),
Row(left=[PinGroup([SD, NC])], right=[PinGroup([VO_plus, VO_minus])]),
],
columns=[
Column(up=[PinGroup([VDD])], down=[PinGroup([GND])]),
],
)
# Pin mappings based on the pin-properties from the original Stanza file
mappings = [
PadMapping(
{
SD: [landpattern.p[1]], # Shutdown pin to pad 1
NC: [landpattern.p[2]], # No connect to pad 2
IN_plus: [landpattern.p[3]], # Positive input to pad 3
IN_minus: [landpattern.p[4]], # Negative input to pad 4
VO_plus: [landpattern.p[5]], # Positive output to pad 5
VDD: [landpattern.p[6]], # Power supply to pad 6
GND: [landpattern.p[7]], # Ground to pad 7
VO_minus: [landpattern.p[8]], # Negative output to pad 8
}
),
]
# Property for datasheet URL
datasheet = "https://www.diodes.com/datasheet/download/PAM8302A.pdf"
[docs]
class PAM8302AADCRCircuit(Circuit):
power = Power()
SD = Port()
IN_plus = Port()
IN_minus = Port()
VO_plus = Port()
VO_minus = Port()
def __init__(self):
self.amp = PAM8302AADCR()
self.nets = [
self.power.Vp + self.amp.VDD,
self.power.Vn + self.amp.GND,
self.SD + self.amp.SD,
self.IN_plus + self.amp.IN_plus,
self.IN_minus + self.amp.IN_minus,
self.VO_plus + self.amp.VO_plus,
self.VO_minus + self.amp.VO_minus,
]
# Bypass Capacitors (1uF and 10uF)
self.c1 = Capacitor(capacitance=1e-6).insert(
self.amp.VDD, self.amp.GND, short_trace=True
)
self.c2 = Capacitor(capacitance=10e-6).insert(
self.amp.VDD, self.amp.GND, short_trace=True
)
self.amp.NC.no_connect()
Device: type[PAM8302AADCRCircuit] = PAM8302AADCRCircuit
