Part Project Review and Validation

flux

2:05

Assess.

Analyzing the schematic.

Analyzing the PCB layout.

Reviewing the bill of materials.

Looking for "part summary description package pin count and ordering information" in ADG2128BCPZ-HS-RL7.pdf

Looking for "absolute maximum ratings supply voltage analog input range digital input voltage current temperature" in ADG2128BCPZ-HS-RL7.pdf

Looking for "recommended operating conditions supply voltage VL VDD VSS analog signal range temperature" in ADG2128BCPZ-HS-RL7.pdf

Looking for "electrical characteristics on resistance leakage capacitance bandwidth THD crosstalk I2C timing" in ADG2128BCPZ-HS-RL7.pdf

Looking for "pin configuration and function descriptions for all pins including EP NC reset SDA SCL A0 A1 A2 VL VDD VSS X0 to X11 Y0 to Y7" in ADG2128BCPZ-HS-RL7.pdf

Looking for "package information dimensions LFCSP 32 lead exposed pad" in ADG2128BCPZ-HS-RL7.pdf

Looking for "features applications special features i2c serial interface reset address pins" in ADG2128BCPZ-HS-RL7.pdf

Analyzing the PCB layout.

Analy.

Assess.

I reviewed the part project for ADG2128BCPZ-HS-RL7 and used the existing datasheet URL already set on the project, so Step 2 was not needed.

Project and Part Metadata Review

Field	Value
MPN	ADG2128BCPZ-HS-RL7
Manufacturer	Analog Devices
Description	Analog Audio/Video 300 MHz 8 x 12 32-Pin LFCSP EP T/R
Datasheet URL	Present on project
Package in project metadata	LFCSP
Datasheet package	32-Lead LFCSP_WQ, CP-32-7, 5 mm x 5 mm
Pin count in schematic	33 pads/pins total
Functional pin count in datasheet	32 leads + exposed pad
Schematic implementation style	One terminal per pin, no internal symbol body
Nets defined	None yet

Schematic Symbol Structure Review

Pin/Terminal	Project pin number	Datasheet function check
VSS	1	Match
NC_1	2	Match
X0 to X5	3-8	Match
Y0 to Y7	9-16	Match
X6 to X11	17-22	Match
NC_2	23	Match
VDD	24	Match
VL	25	Match
SDA	26	Match
SCL	27	Match
A0, A1, A2	28-30	Match
~RESET	31	Function matches RESET pin
GND	32	Match
EP	33	Match to exposed pad

Datasheet Metadata Summary

Category	Extracted data
Device type	I2C-compatible CMOS 8 x 12 unbuffered analog switch array
Channels	96 bidirectional switch channels
I2C support	100 kHz, 400 kHz, 3.4 MHz (-HS version)
Bandwidth	Up to 300 MHz
On resistance	35 Ohm max
Quiescent current	< 20 uA
Logic features	Double-buffered input logic, simultaneous update of multiple switches, readback in standard/fast mode
Reset behavior	RESET low opens all switches and clears registers; power-on reset defaults all switches off
Addressing	7-bit slave address, MSBs fixed to 1110, LSBs set by A0, A1, A2
Applications	AV switching, automotive infotainment, CCTV, ultrasound, KVM, telecom, instrumentation, PBX

Absolute Maximum Ratings

Parameter	Rating
VDD to VSS	15 V
VDD to GND	-0.3 V to +15 V
VSS to GND	+0.3 V to -7 V
VL to GND	-0.3 V to +7 V
Analog inputs	VSS - 0.3 V to VDD + 0.3 V
Digital inputs	-0.3 V to VL + 0.3 V or 30 mA, whichever occurs first
Continuous current, single input to single output, 10 V on input	65 mA
Continuous current, single input to single output, 1 V on input	90 mA
Continuous current, eight inputs to eight outputs, 10 V on input	25 mA
Operating temperature, B version	-40 C to +85 C
Operating temperature, Y version	-40 C to +125 C
Storage temperature	-65 C to +150 C
Junction temperature	150 C

Recommended / Characterized Operating Conditions

Condition	Value
Single-supply characterization	VDD = 12 V ± 10%, VSS = 0 V, VL = 5 V, GND = 0 V
Dual-supply characterization	VDD = +5 V ± 10%, VSS = -5 V ± 10%, VL = 5 V, GND = 0 V
Analog signal range	VDD - 2 V max
Temperature range, B version	-40 C to +85 C
Temperature range, Y version	-40 C to +125 C

Key Electrical Characteristics

Parameter	Datasheet values
On resistance at 12 V / 0 V supplies	30 Ohm typ / 35-40 Ohm max at VIN = 0 V; 32 Ohm typ / 37-42 Ohm max at VIN = 1.4 V; 45 Ohm typ / 50-57 Ohm max at VIN = 5.4 V
On resistance at +5 V / -5 V supplies	34 Ohm typ / 40-45 Ohm max at VIN = VSS; 50 Ohm typ / 55-65 Ohm max at VIN = 0 V; 66 Ohm typ / 75-85 Ohm max at VIN = 1.4 V
Channel leakage	±0.03 uA typ on/off
Capacitance at 12 V / 0 V	COFF 11 pF typ, CON 18.5 pF typ
Capacitance at +5 V / -5 V	COFF 6 pF typ, CON 9.5 pF typ
-3 dB bandwidth, individual channel	210 MHz typ at 12 V / 0 V, 300 MHz typ at +5 V / -5 V
-3 dB bandwidth, 8 inputs to 1 output	16.5 MHz typ at 12 V / 0 V, 18 MHz typ at +5 V / -5 V
THD + N	0.04% typ
Crosstalk at 5 MHz	Adjacent -63 dB typ / -62 dB typ, nonadjacent -76 dB typ / -79 dB typ

I2C Timing Highlights

Parameter	Value
fSCL	100 kHz, 400 kHz, 3.4 MHz with CB = 100 pF max; 1.7 MHz with CB = 400 pF max
tHIGH	4 us, 0.6 us, 60 ns / 120 ns
tLOW	4.7 us, 1.3 us, 160 ns / 320 ns
tSU;DAT	250 ns, 100 ns, 10 ns
tHD;DAT	0 to 3.45 us, 0 to 0.9 us, 0 to 70 ns / 150 ns

Pin Descriptions

Pin(s)	Function
VSS	Negative supply in dual-supply mode; tie to ground in single-supply mode
NC_1, NC_2	Not connected internally; do not connect
X0 to X11	Analog switch terminals, bidirectional
Y0 to Y7	Analog switch terminals, bidirectional
VDD	Positive power supply input
VL	Logic power supply input
SDA	Bidirectional open-drain data line; external pull-up required
SCL	Serial clock input; external pull-up required
A0, A1, A2	Address select inputs
~RESET	Active-low reset; opens all switches and clears registers
GND	Ground reference
EP	Exposed pad; solder to VSS; recommended for heat dissipation and crosstalk improvement

Package Dimensions

Item	Datasheet value
Package	32-Lead LFCSP_WQ (CP-32-7)
Body size	5.10 / 5.00 / 4.90 mm square
Pitch	0.50 mm BSC
Package height	0.80 / 0.75 / 0.70 mm
Terminal length	0.50 / 0.40 / 0.30 mm
Lead width	0.30 / 0.25 / 0.18 mm
Exposed pad	3.25 / 3.10 / 2.95 mm square
Coplanarity	0.08 mm

Cross-Check: Symbol and Footprint vs Datasheet

Check item	Result	Risk
Pin count	Pass - project has 32 leads + exposed pad	Low
Pin numbering	Pass - schematic numbering matches datasheet Table 5	Low
NC pins	Pass - NC_1 and NC_2 are correctly present	Low
RESET naming	Pass - ~RESET matches active-low RESET function	Low
Exposed pad presence	Pass - EP exists as pad 33	Low
Exposed pad electrical requirement	Warning - datasheet says exposed pad is soldered to VSS and recommends soldering to VSS for thermal/crosstalk reasons; project currently has no nets defined	High if left unconnected in a real design
Footprint package family	Pass with note - footprint asset name is `QFN50P500X500X80-33N-D`, while datasheet calls package LFCSP_WQ CP-32-7; dimensions and 33-pad structure align	Medium metadata ambiguity only
Footprint pitch	Pass - 0.50 mm matches datasheet	Low
Exposed pad size	Pass - footprint center pad 3.25 mm x 3.25 mm matches datasheet max exposed pad size	Low
Pad count/orientation	Pass - 8 pads per side plus EP matches package	Low
Pull-up requirements on serial pins	Warning - datasheet requires external pull-ups on SDA and SCL; none exist in this part-only project	Not a part-library failure, but important for end-use design

Issues Most Likely to Matter

Priority	Finding	Why it matters
1	EP must be tied to VSS in downstream designs	Could cause electrical/thermal/crosstalk problems if omitted
2	Package metadata is generic `LFCSP`, while datasheet-specific package is CP-32-7 / LFCSP_WQ	Could increase part-ordering or footprint-selection confusion
3	No nets are defined in the part project	Prevents validating electrical intent beyond pin mapping

Bottom Line

Verdict	Summary
Symbol pinout	Good
Footprint geometry	Looks consistent with datasheet
Manufacturing-blocking mismatch found	None obvious
Important caution	Ensure EP is connected to VSS in actual use, and keep package naming specific to CP-32-7

If you want, I can next turn this into a concise part QA checklist or a cleaned-up pin/property table for the part definition.

Create QA checklist

Pin property table

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56 days

Reviews

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