My Inquiry
My Account
Analog Devices Inc. LTC6904HMS8#TRPBF
- Part No.:
- LTC6904HMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC6904HMS8#TRPBF.pdf
- Description:
- IC OSC SILICON PROG 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,898
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC6904HMS8#TRPBF from Analog Devices (formerly Linear Technology) is an I²C-compatible, digitally programmable oscillator IC delivering a precise square-wave clock output from 1.039 kHz to 68 MHz. It features 0.5% typical initial frequency accuracy, 10 ppm/°C temperature drift, and operates from a single 2.7V–5.5V supply. Designed for microcontroller clocking and precision timing in industrial control systems, it requires only a 0.1 µF bypass capacitor.
For engineers reviewing the LTC6904HMS8#TRPBF datasheet, LTC6904HMS8#TRPBF pinout, LTC6904HMS8#TRPBF application, or LTC6904HMS8#TRPBF equivalent, this device offers deterministic frequency setting via 4-bit OCT and 10-bit DAC registers, I²C address selection (ADR pin), asynchronous output enable (OE), and dual buffered CLK/CLK outputs - all in an MS8 package rated for –40°C to 125°C operation.
Technical Context
The LTC6904HMS8#TRPBF integrates a high-frequency VCO (34–68 MHz) with a proprietary feedback loop that linearizes digital-to-frequency mapping using a 10-bit resistor DAC and 4-bit octave divider. Its internal architecture ensures monotonic frequency response across OCT transitions and guarantees 10-bit DAC monotonicity.
It implements a receive-only I²C slave interface compliant with SMBus timing (10–100 kHz), supporting two 7-bit addresses (0010110 or 0010111) selected by the ADR pin. Output configuration (CLK/CLK on/off/powered-down) and frequency are controlled via a 16-bit register map with power-up default of 1.039 kHz and both outputs enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 1.039 kHz to 68 MHz - digitally programmable in 0.1% resolution steps via OCT/DAC registers |
| Initial Accuracy | ±0.75% (min), ±0.5% (typ) at 1.039 kHz - enables calibration-free timing in embedded control loops |
| Temp Drift | 10 ppm/°C (typ) - supports stable operation across –40°C to 125°C without external compensation |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains and mixed-voltage systems |
| I²C Interface | 10–100 kHz SMBus-compliant - allows direct connection to MCU I²C peripherals without level-shifting |
| Output Drive | 45 Ω output resistance, 5 pF load capability - ensures clean 50% duty cycle up to 68 MHz into HC-series logic |
| Jitter | 0.4% (typ) peak-to-peak (1–8.5 MHz), 1% (typ) up to 68 MHz - suitable for ADC sampling clocks and serial interfaces |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0 mm × 3.0 mm × 0.86 mm, –40°C to 125°C operating range, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Must connect directly to low-impedance ground plane; critical for jitter and accuracy performance |
| SDI (Pin 2) | I²C data line (SDA) | Bi-directional open-drain I²C bus line; requires external pull-up to V+ |
| SCK (Pin 3) | I²C clock line (SCL) | Input-only clock line; timing-critical for SMBus compliance (tLOW ≥ 4.7 µs, tHIGH ≥ 4.0 µs) |
| ADR (Pin 4) | I²C slave address LSB | Configures 7-bit address as 0010110 (ADR = 0) or 0010111 (ADR = 1); sets unique bus identity |
| CLK (Pin 5) | Auxiliary clock output | Inverted (180° out-of-phase) copy of main CLK when CNF[1:0] = 00; independently controllable |
| CLK (Pin 6) | Main clock output | Primary square-wave output; frequency set by OCT/DAC; driven from internal VCO divider |
| OE (Pin 7) | Asynchronous output enable | Active-low; forces both CLK pins LOW immediately - no propagation delay, used for glitch-free gating |
| V+ (Pin 8) | Positive supply | 2.7–5.5 V input; requires parallel 1 µF + 0.01 µF ceramic bypass within 3 mm of pin for <1.1% total error |
Key Features
| Feature | Design Value |
|---|---|
| Digital frequency programming | 16-bit register (OCT[3:0] + DAC[9:0]) enables exact frequency synthesis without external components |
| I²C address selectability | ADR pin selects between two factory-programmed 7-bit addresses - supports multiple LTC6904HMS8#TRPBF on same bus |
| Output configuration control | CNF[1:0] bits allow independent ON/OFF or powered-down state for each CLK output - reduces power and improves accuracy |
| Monotonic frequency stepping | Guaranteed monotonicity across OCT boundaries (e.g., OCT=11 → OCT=12) prevents frequency undershoot/overshoot |
| Industrial temperature grade | H-grade MS8 package qualified for –40°C to 125°C ambient - suitable for engine control, power converters, and avionics |
Applications
| Microcontroller Clock Source | Power Management Sequencing |
|---|---|
|
Use Scenario: Providing a stable, software-configurable clock to an ARM Cortex-M4 MCU in an industrial PLC where crystal oscillators are prohibited due to shock/vibration sensitivity. IC Role / Device Role / Timing Role: Primary system clock generator with dynamic frequency scaling during low-power modes via I²C commands. Use Value: Eliminates need for multiple crystals or external PLLs; enables runtime clock adjustment without firmware reflash or hardware change. |
Use Scenario: Generating synchronized enable signals for multi-rail DC/DC converters (12 V, 5 V, 3.3 V, 1.8 V) in telecom base station power supplies. IC Role / Device Role / Timing Role: Precision timing source for sequencer logic (e.g., 74HC4040 counter + decoder) controlling power-up order and delays. Use Value: Achieves ±1% timing accuracy over temperature - tighter than RC-based solutions - ensuring safe rail sequencing under thermal stress. |
| Switched-Capacitor Filter Clock | DDS Reference Clock |
|
Use Scenario: Driving the clock input of a 4th-order switched-capacitor anti-alias filter (e.g., LTC1064) in a vibration sensor signal chain operating at 125°C ambient. IC Role / Device Role / Timing Role: Low-jitter, temperature-stable clock source whose frequency directly sets filter cutoff (fc ∝ fCLK). Use Value: Maintains filter corner stability within ±0.5% over full temperature range - critical for consistent analog signal conditioning. |
Use Scenario: Serving as the master reference clock for a direct digital synthesizer (e.g., AD9833) in a portable RF test instrument requiring 1–20 MHz tunable output. IC Role / Device Role / Timing Role: High-resolution, low-phase-noise reference enabling <1 mHz frequency step resolution in DDS output. Use Value: Enables sub-Hz frequency resolution without external VCXO or complex PLL design - reduces BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally programmable oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6904IMS8#TRPBF | Same functionality and pinout; rated for –40°C to 85°C (not 125°C) | Not suitable for under-hood automotive or high-temp industrial environments | Select if operating ambient stays ≤85°C and cost optimization is prioritized |
| LTC6903HMS8#TRPBF | SPI interface instead of I²C; identical frequency range, accuracy, and package | Requires SPI-capable host MCU; incompatible with I²C-only controllers | Choose when existing design uses SPI peripherals and board layout cannot accommodate I²C pull-ups |
Compared with LTC6904IMS8#TRPBF and LTC6903HMS8#TRPBF, the LTC6904HMS8#TRPBF uniquely combines I²C compatibility with extended –40°C to 125°C operation - making it the only drop-in option for thermally demanding, I²C-based timing applications requiring guaranteed performance at maximum junction temperature.
Availability
LTC6904HMS8#TRPBF is available at Aetrix Electronics and suitable for industrial control systems, automotive powertrain modules, and high-reliability instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC6904HMS8#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and timing product lines. Linear pioneered high-performance programmable oscillators with integrated DAC-based frequency synthesis.
The LTC6904HMS8#TRPBF belongs to Linear's digitally programmable oscillator family, designed specifically for replacing crystal oscillators and discrete DAC+VCO combinations in space-constrained, thermally aggressive embedded systems.
FAQ
What is the power-up default frequency of the LTC6904HMS8#TRPBF?
At power-up, all internal registers reset to zero, resulting in an output frequency of exactly 1.039 kHz on both CLK and CLK pins. This value is derived from the frequency equation f = 2078 × 2^(OCT−10)/DAC with OCT = 0 and DAC = 0, and is guaranteed across the full –40°C to 125°C operating range for the LTC6904HMS8#TRPBF.
Can the LTC6904HMS8#TRPBF drive a 10 pF capacitive load?
No - the LTC6904HMS8#TRPBF is specified for accurate operation only up to 5 pF per output. Driving 10 pF (e.g., a standard 10× oscilloscope probe) degrades frequency accuracy by up to 0.5% at 68 MHz and increases jitter. For loads >5 pF, a high-speed buffer such as the LTC6904HMS8#TRPBF must be used to maintain datasheet performance.
How does the ADR pin affect I²C communication with the LTC6904HMS8#TRPBF?
The ADR pin sets the least significant bit of the LTC6904HMS8#TRPBF's 7-bit I²C slave address: ADR = 0 yields address 0x26 (0010110), and ADR = 1 yields address 0x27 (0010111). This allows two LTC6904HMS8#TRPBF devices to share the same I²C bus without address conflict, provided their ADR pins are tied to opposite rails.
What is the maximum allowed capacitive load on the OE pin of the LTC6904HMS8#TRPBF?
The OE pin of the LTC6904HMS8#TRPBF is a CMOS input with ≤10 µA leakage current and no specified capacitive loading limit. However, to ensure sub-microsecond enable/disable response and avoid noise-induced glitches, PCB trace capacitance should remain below 20 pF. No external capacitor is required or recommended on the OE line.
Does the LTC6904HMS8#TRPBF support repeated START conditions on the I²C bus?
Yes - the LTC6904HMS8#TRPBF fully complies with I²C specification timing for repeated START conditions, requiring tHD,STA ≥ 4.0 µs and tSU,STA ≥ 4.7 µs. This enables multi-byte write sequences without bus release, essential for atomic updates of the 16-bit frequency register (OCT + DAC) without intermediate invalid states.
LTC6904HMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Oscillator, Silicon
- Count:
- -
- Frequency:
- 1kHz ~ 68MHz
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 7 mA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6904HMS8#TRPBF FAQ
1.How can I place an order for LTC6904HMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6904HMS8#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC6904HMS8#TRPBF reliable?
The price and inventory of LTC6904HMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6904HMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6904HMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6904HMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6904HMS8#TRPBF?
LTC6904HMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6904HMS8#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC6904HMS8#TRPBF?
For technical support, including LTC6904HMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6904HMS8#TRPBF requirements.
6.How does Aetrix verify that LTC6904HMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6904HMS8#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC6904HMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6904HMS8#TRPBF?
All LTC6904HMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6904HMS8#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC6904HMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC6904HMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC6904HMS8#TRPBF Tags
-
NE555DR
Texas Instruments
-
SA555DR
Texas Instruments
-
NA555DR
Texas Instruments
-
SE555DR
Texas Instruments
-
NE555P
Texas Instruments
-
CD4541BM96
Texas Instruments
-
CD4541BE
Texas Instruments
-
TLC555QDR
Texas Instruments
-
TLC555IDR
Texas Instruments
-
TLC555QDRQ1
Texas Instruments
-
TPL5010DDCR
Texas Instruments
-
TLC555CP
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
