Product Info

1.1 USB Interface
LM746 has a full-speed (12Mbps) USB interface for communicating with other compatible digital devices.
The USB interface on LM746 acts as a USB peripheral, responding to requests from a master host controller. LM746 contains internal USB termination
resistors and requires no external resistor matching.
LM746 supports the Universal Serial Bus Specification, Revision v2.0 (USB v2.0 Specification), supports
USB standard charger detection and fully supports the USB Battery Charging Specification, available from http://www.usb.org. For more information on
how to integrate the USB interface on LM746 see the Bluetooth® and USB Design Considerations Application Note.
As well as describing USB basics and architecture, the application note describes:
Power distribution for high and low bus-powered configurations
Power distribution for self-powered configuration, which includes USB VBUS monitoring
USB enumeration
Electrical design guidelines for the power supply and data lines, as well as PCB tracks and the eects of ferrite beads
USB suspend modes and Bluetooth® low-power modes:
- Global suspend
- Selective suspend, includes remote wake
- Wake on Bluetooth®, includes permitted devices and set-up prior to selective suspend - Suspend mode current draw
- PIO status in suspend mode
- Resume, detach and wake PIOs
Battery charging from USB, which describes dead battery provision, charge currents, charging in suspend modes and USB VBUS voltage considera-
tion
USB termination when interface is not in use
Internal modules, certification and non-specification compliant operation
LM746 Bluetooth® Dual Mode Audio Module
Standalone (With Embedded Bluetooth® 5 Compliant Stack)
RF Specification: Temperature = +20° C Continued...
1. Serial Interface
Receiver
F = F0 + 2MHz
Adjacent channel selectivity C/I F = F0 - 2MHz
Adjacent channel selectivity C/I F = F0 + 3MHz
Adjacent channel selectivity C/I F = F0 - 5MHz
Adjacent channel selectivity C/I F = FImage
Maximum level of intermodulation interferers
Spurious output level
Min
-
-
--
-
-39
-
Typ
-25
-45
-45
-20
-23
-155
Max
-20
-40
-40
-9
-
-
Bluetooth® Specification
≤-20
≤-40
≤-40
≤-9
≥-39
Unit
dB
dB
dB
dB
dBm
dBm/Hz
Part No
Product
See Last Page
LM746
LM746
Page 10 of 21
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