DS8005-RJX+

Analog Front End (AFE) Overview

The DS8005-RJX+ is a dual smart card interface analog front-end in a 28-pin TSSOP package. It supports mutually exclusive communication with two ISO 7816, EMV, and B-CAS compliant cards. The device operates on a digital supply (VDD) of 2.7V to 6.0V and requires a VDDA supply of at least 4.75V for internal voltage generation. It provides regulated outputs of 5.0V (max 80mA), 3.0V (max 65mA), and 1.8V (max 30mA). Key electrical parameters include an ultra-low stop-mode current of less than 10nA typical and ±8kV ESD protection on card interfaces.

Analog Front End (AFE) Feature Summary

• Dual analog front-end supporting mutually exclusive operation with two smart cards
• Internal voltage generation providing 5.0V (80mA max), 3.0V (65mA max), and 1.8V (30mA max)
• Ultra-low stop-mode current consumption of less than 10nA typical
• ±8kV minimum ESD protection on card interfaces per HBM standard

Analog Front End (AFE) Applications

• Set-Top Box Conditional Access systems
• Telecommunications equipment
• Pay Television terminals
• Access Control hardware
• Financial Terminals

Analog Front End (AFE) Procurement Notes

Verify the RJX+ suffix confirms the 28-TSSOP package variant during sourcing. Confirm RoHS compliance status as indicated by the plus sign. Check for availability constraints or discontinuation notices from Analog Devices/Maxim Integrated distributors prior to ordering.

Analog Front End (AFE) Selection Notes

Select this component when designing readers requiring simultaneous physical sockets but mutually exclusive logical access. Ensure the host microcontroller has an ISO 7816 UART or sufficient bandwidth for bit-banging. Verify that C4/C8 contacts are not required, as this device does not support AUX1/AUX2 lines.

Analog Front End (AFE) Part Context

This part belongs to the DS8005 series, which includes variants like the DS8005-RRX+ in a 28-SOIC package. The pinout is backwards compatible with the DS8313, allowing reuse of existing PCB footprints designed for single-card applications. It serves as a low-cost alternative to using two separate DS8024 devices with external multiplexing.

Analog Front End (AFE) Replacement Considerations

The DS8005-RRX+ offers identical functionality in a 28-SOIC package. For single-card applications, the DS8313 is a compatible predecessor with the same footprint.