Texas Instruments SN761664DBTRG4

Overview

SN761664DBTRG4 from Texas Instruments is a 38-pin TSSOP digital TV tuner IC integrating VHF-L/VHF-H/UHF three-band local oscillator, low-phase-noise PLL synthesizer, mixer, 30-V tuning voltage amplifier, four NPN band-switch drivers, and I²C interface. It delivers 35 dB conversion gain and 9–12 dB noise figure across 57–864 MHz RF input bands, with 4-MHz crystal oscillator output and 15-bit programmable divider for DTV and CATV set-top box applications.

For engineers reviewing the SN761664DBTRG4 datasheet, SN761664DBTRG4 pinout, SN761664DBTRG4 application, or SN761664DBTRG4 equivalent, key selection considerations include its triple-band RF input support (VLO/VHI/UHF), 30-V VTU output capability, I²C-configurable reference divider (24/28/50/64/80/128), 5-V supply operation, and integrated RF AGC detector with programmable start-point control.

Technical Context

The SN761664DBTRG4 implements a fully integrated PLL-based frequency synthesis architecture with separate VHF-L, VHF-H, and UHF oscillator/mixer sections sharing a common IF amplifier chain. Its charge-pump current is software-selectable (70–600 µA) via CP[1:0], and reference division ratio is configurable across six values (24 to 128) to support multiple crystal frequencies and channel spacing requirements.

It features dual IF outputs (IF OUT1/IF OUT2), two mixer outputs (MIX OUT1/MIX OUT2), and four independent NPN band-switch drivers (BS1–BS4) with 10 mA sink capability. The 5-level ADC on P5/ADC supports auxiliary analog monitoring, while AS pin enables hardware address selection for multi-device I²C bus configurations.

Key Specifications

Pinout & Package

SN761664DBTRG4 is housed in a 38-pin Thin Shrink Small-Outline Package (TSSOP), DBT package drawing, with 0.65 mm lead pitch and exposed pad not present. Pin numbering follows top-view orientation per TI SLES184.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DTV tuner IC applications.

Compared with SI2151-A10-GM and MAX2161ETJ+, the SN761664DBTRG4 uniquely combines triple-band oscillator integration, 30-V VTU output, and four on-die band-switch drivers-making it irreplaceable in legacy IF-based DTV tuner designs requiring external SAW filtering and wide varactor tuning range.

Availability

SN761664DBTRG4 is available at Aetrix Electronics and suitable for digital TV receivers, digital CATV set-top boxes, and terrestrial broadcast tuner modules requiring stable component supply and long-term industrial availability.

Supply support for SN761664DBTRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.

The SN761664DBTRG4 belongs to TI's legacy broadcast tuner IC product line, engineered specifically for high-performance, cost-optimized digital television and cable TV reception systems with emphasis on phase noise, conversion gain, and integration density.

FAQ

What is the operating supply voltage range for the SN761664DBTRG4?

The SN761664DBTRG4 operates from 4.5 V to 5.5 V, with nominal 5-V operation. Absolute maximum supply voltage is 6.5 V. Operation below 4.5 V may cause improper PLL lock or band-switch driver dropout; above 5.5 V risks exceeding absolute maximum ratings and degrading long-term reliability. The SN761664DBTRG4 must be powered within this window for guaranteed functionality across –20°C to 85°C ambient temperature.

Does the SN761664DBTRG4 support I²C communication at 400 kHz?

Yes, the SN761664DBTRG4 supports Fast-mode I²C operation up to 400 kHz, with specified timing parameters including tLOW ≥ 0.6 µs, tHIGH ≥ 0.6 µs, and tf/tr ≤ 0.3 µs. Its SDA and SCL pins meet standard I²C electrical specifications (VIH ≥ 2.3 V, VIL ≤ 1.35 V at 5 V), enabling direct interfacing with microcontrollers such as MSP430 or ARM Cortex-M series without level-shifting. The SN761664DBTRG4 also retains XTALOUT functionality during I²C transactions.

How many reference divider ratios does the SN761664DBTRG4 support, and how are they selected?

The SN761664DBTRG4 supports six reference divider ratios: 24, 28, 50, 64, 80, and 128. These are selected via RS[2:0] bits in Control Byte 1 (CB1) using the I²C interface. The mapping is defined in Table 5 of the datasheet: RS2–RS0 = 000 → 24, 001 → 28, 010 → 50, 011 → 64, 100 → 128, and 1X1 → 80. This enables precise IF alignment for ATSC (6-MHz), DVB-T (7/8-MHz), and ISDB-T (6-MHz) standards. The SN761664DBTRG4 defaults to RS[2:0] = 111 (unlisted), requiring initialization for valid operation.

What is the purpose of the AS pin on the SN761664DBTRG4?

The AS (Address Select) pin on the SN761664DBTRG4 sets the I²C slave address by applying one of four voltage levels: 0–0.1×VCC (MA1=0, MA0=0), open/mid2 (0.2–0.3×VCC), mid1 (0.4–0.6×VCC), or high (0.9–VCC). This allows up to four SN761664DBTRG4 devices to share the same I²C bus without address conflict. The AS pin is sampled at power-on reset and latched; changing it during operation has no effect. The SN761664DBTRG4 uses this hardware address selection to avoid software-configured address collisions in multi-tuner systems.

Can the SN761664DBTRG4 operate in standby mode while maintaining XTALOUT functionality?

Yes, the SN761664DBTRG4 supports standby mode (STBY = 1) with XTALOUT remaining active. In standby, the PLL, oscillators, and mixers halt, reducing supply current to 8 mA, but the crystal oscillator continues running and drives XTALOUT. This allows external devices to retain a stable 4-MHz clock during low-power states. The SN761664DBTRG4 achieves this via dedicated oscillator enable logic that isolates XTALOUT from the main power domain. Band-switch drivers and I²C remain functional for wake-up signaling.