SN75LVDS84ADGG - FlatLink 21:3 LVDS Transmitter | Texas Instruments
MPN: SN75LVDS84ADGG ✓ Hoạt độngSN75LVDS84ADGG Tóm tắt
An LVDS serializer (also called an LVDS transmitter, FlatLink, or channel link) is a parallel-to-serial interface IC belonging to the broader LVDS (Low-Voltage Differential Signaling) family of interface ICs. The category hierarchy is: LVDS serializer → LVDS interface IC → display interface → signal conditioning IC → interface IC. LVDS transmits data as a small differential current (~3.5 mA) across a 100 Ω termination, producing low-EMI, low-power, high-speed point-to-point links over twisted-pair cabling or PCB traces.
Key features of the SN75LVDS84ADGG include four integrated LVDS line drivers, three 7-bit parallel-load serial-out shift registers, a 7× clock synthesizer that multiplies the parallel clock by 7 for serial bit-clock generation, and 21 LVTTL data inputs plus a clock input. The on-chip PLL generates the high-speed serialization clock from a low-frequency reference, eliminating the need for an external high-frequency oscillator. The device is typically paired with an SN75LVDS82 / SN75LVDS86A receiver at the display end.
Architecturally, the SN75LVDS84A uses a PLL-based 7:1 serialization scheme per channel. Each LVTTL data bit is sampled on the rising edge of the parallel clock, latched into a shift register, then clocked out at 7× the input clock frequency onto its differential pair. This architecture achieves aggregate throughput of 196 MBps while consuming only about 100 mW typical power from a single 3.3 V supply. The receiver counterpart (SN75LVDS82/SN75LVDS84A pair) reverses this process, recovering the parallel data and clock from the three LVDS data pairs.
Typical applications include notebook LCD panels, desktop monitor controllers, industrial flat-panel displays, and point-of-sale terminals using XGA/SXGA TFT panels. The TSSOP-48 footprint is the de-facto standard for FlatLink chipsets, enabling drop-in compatibility across the SN75LVDS84A family and most third-party clones. The SN65LVDS84AQ variant provides the same functionality with automotive-grade qualification (AEC-Q100) for in-vehicle display systems.
When designing with this device, pay close attention to PCB layout: the four LVDS differential pairs should be routed as 100 Ω-impedance matched pairs with intra-pair skew under 50 ps, and the LVTTL bus should be length-matched to within ±1 inch to avoid setup/hold violations at the rising-edge sample point. A 100 Ω termination resistor across each LVDS pair at the receiver end is mandatory for proper signal swing.
Bộ thay thế dễ dàng lắp đặt cho SN75LVDS84ADGG — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với SN75LVDS84ADGG (cùng hình factor và footprint) — khác nhau ở Data Rate, Function.
SN75LVDS84ADGGR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SN75LVDS84ADGGG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65LVDS84AQDGG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN75LVDS84DGGR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN75LVDS83BDGGR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN75LVDS84ADGG Thông số kỹ thuật
| Chức năng | FlatLink Transmitter (LVDS Serializer) |
| Number of Drivers | 4 (3 data + 1 clock) |
| Tốc độ dữ liệu | 196 MBps (MegaBytes per second) |
| Parallel Inputs | 21 LVTTL data bits + 1 clock |
| Serial Outputs | 3 LVDS data pairs + 1 LVDS clock pair |
| Điện áp cung cấp | 3.0 V to 3.6 V (3.3 V typical) |
| Nhiệt độ hoạt động | 0°C to +70°C (Commercial) |
| Hộp | 48-pin TSSOP (DGG) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Data Channel Compression | 21:3 (21 bits serialized over 3 differential pairs) |
Cấu hình chân SN75LVDS84ADGG
| Chân 1 | D0 — LVTTL data input bit 0 (LSB of red channel) |
| Chân 2 | D1 — LVTTL data input bit 1 |
| Chân 3 | D2 — LVTTL data input bit 2 |
| Chân 4 | D3 — LVTTL data input bit 3 |
| Chân 5 | D4 — LVTTL data input bit 4 |
| Chân 6 | D5 — LVTTL data input bit 5 |
| Chân 7 | D6 — LVTTL data input bit 6 (MSB of red channel) |
| Chân 8 | GND — Ground |
| Chân 9 | D7 — LVTTL data input bit 7 (LSB of green channel) |
| Chân 10 | D8 — LVTTL data input bit 8 |
| Chân 11 | D9 — LVTTL data input bit 9 |
| Chân 12 | D10 — LVTTL data input bit 10 |
| Chân 13 | D11 — LVTTL data input bit 11 |
| Chân 14 | D12 — LVTTL data input bit 12 |
| Chân 15 | D13 — LVTTL data input bit 13 (MSB of green channel) |
| Chân 16 | GND — Ground |
| Chân 17 | D14 — LVTTL data input bit 14 (LSB of blue channel) |
| Chân 18 | D15 — LVTTL data input bit 15 |
| Chân 19 | D16 — LVTTL data input bit 16 |
| Chân 20 | D17 — LVTTL data input bit 17 |
| Chân 21 | D18 — LVTTL data input bit 18 |
| Chân 22 | D19 — LVTTL data input bit 19 |
| Chân 23 | D20 — LVTTL data input bit 20 (MSB of blue channel) |
| Chân 24 | CLKIN — LVTTL parallel clock input |
| Chân 25 | VCC — 3.3 V power supply |
| Chân 26 | GND — Ground |
| Chân 27 | Y0M — LVDS data output 0 (negative) |
| Chân 28 | Y0P — LVDS data output 0 (positive) |
| Chân 29 | Y1M — LVDS data output 1 (negative) |
| Chân 30 | Y1P — LVDS data output 1 (positive) |
| Chân 31 | Y2M — LVDS data output 2 (negative) |
| Chân 32 | Y2P — LVDS data output 2 (positive) |
| Chân 33 | GND — Ground |
| Chân 34 | VCC — 3.3 V power supply |
| Chân 35 | CLKM — LVDS clock output (negative) |
| Chân 36 | CLKP — LVDS clock output (positive) |
| Chân 37 | NC — Not connected |
| Chân 38 | NC — Not connected |
| Chân 39 | NC — Not connected |
| Chân 40 | NC — Not connected |
| Chân 41 | NC — Not connected |
| Chân 42 | NC — Not connected |
| Chân 43 | NC — Not connected |
| Chân 44 | NC — Not connected |
| Chân 45 | NC — Not connected |
| Chân 46 | NC — Not connected |
| Chân 47 | VCC — 3.3 V power supply |
| Chân 48 | GND — Ground |
Ứng dụng tiêu biểu
SN75LVDS84ADGG phù hợp cho 6 Áp dụngs: Notebook LCD Panel Interface, Desktop Monitor Controller Board, Industrial Flat-Panel Display, Point-of-Sale Terminal Display, Medical Imaging Display, Automotive Infotainment Display (with Q-grade variant).
Notebook LCD Panel Interface
The SN75LVDS84ADGG is the standard LVDS serializer used in notebook designs to drive XGA/SXGA TFT LCD panels from the graphics controller. Its 196 MBps throughput comfortably supports 1024x768 XGA at 60 Hz refresh using a single LVDS link, while the low EMI of LVDS signaling (compared to parallel LVTTL) simplifies FCC/CE certification of the notebook chassis. The 3.3 V single-supply operation matches typical notebook power rails, and the 48-pin TSSOP package fits within the constrained BGA area of notebook motherboard layouts. Typical implementations place the SN75LVDS84ADGG adjacent to the GPU/chipset and route four 100 Ω differential pairs to the display connector.
Được đề xuất
Desktop Monitor Controller Board
In desktop LCD monitors, the SN75LVDS84ADGG receives 21 bits of parallel LVTTL data from the scalar chip and serializes it into four LVDS differential pairs for transmission across the internal flex cable to the TFT panel. The 21:3 compression reduces 21 parallel PCB traces to just 8 signal traces (4 differential pairs), dramatically simplifying flex-cable routing and improving manufacturing yield. The flatlink chipset (SN75LVDS84A + SN75LVDS82/86A) supports pixel clock rates up to 65 MHz, enabling SXGA (1280x1024) at 60 Hz and XGA (1024x768) at 75 Hz. Engineers pair the transmitter with the SN75LVDS82 or SN75LVDS86A receiver at the panel's TCON (timing controller) side.
Được đề xuất
Industrial Flat-Panel Display
For industrial HMI panels, factory-floor touchscreens, and medical-grade monitors, the SN75LVDS84ADGG provides reliable long-distance (>1 m) digital video transmission over twisted-pair or flex cable. LVDS common-mode rejection and differential signaling make it immune to the EMI generated by industrial motor drives and switching power supplies, unlike parallel LVTTL which would require extensive shielding. The commercial 0°C to +70°C operating range suits indoor industrial environments, while the SN65LVDS84AQ variant extends coverage to -40°C to +85°C for outdoor and automotive-grade HMIs. The TSSOP-48 footprint simplifies PCB rework in legacy industrial designs.
Được đề xuất
Point-of-Sale Terminal Display
POS terminals and electronic cash registers use the SN75LVDS84ADGG to drive operator-facing LCD panels from the main processor board, with the LVDS link often routed through a hinge or cable assembly to the display head. The compact TSSOP-48 package fits in the tight enclosures typical of POS hardware, while the 196 MBps throughput supports XGA/WXGA touch-panel displays used for signature capture and menu navigation. The single 3.3 V supply simplifies power tree design in battery-backed POS terminals, and the wide common-mode range of LVDS receivers tolerates ground-potential differences across long hinge-cable runs. Engineers often pair the SN75LVDS84ADGG with a resistive or capacitive touch controller on the same I2C/SPI bus.
Được đề xuất
Medical Imaging Display
Diagnostic medical monitors (e.g., endoscopy displays, ultrasound review stations) leverage the SN75LVDS84ADGG's clean LVDS signaling to preserve image fidelity over the link from the acquisition/processing board to the high-resolution LCD panel. The low-jitter PLL-based serialization maintains pixel-clock accuracy critical for pixel-perfect diagnostic images, while the differential LVDS pairs reject common-mode noise from switching power supplies and adjacent analog signal chains. For medical-grade reliability, the SN75LVDS84ADGG's commercial temperature range (0°C to +70°C) suits climate-controlled clinical environments, and its RoHS-compliant TSSOP package meets medical-device material restrictions. The chipset pairs with SN75LVDS86A receivers at the panel TCON.
Được đề xuất
Automotive Infotainment Display (with Q-grade variant)
For in-vehicle infotainment (IVI) displays, instrument clusters, and rear-seat entertainment screens, designers select the SN65LVDS84AQ (AEC-Q100 qualified, -40°C to +85°C) as a drop-in upgrade over the SN75LVDS84ADGG in the same TSSOP-48 footprint. The LVDS serializer transmits video from the head-unit main board across the vehicle's wiring harness to the display panel, tolerating ground bounce, EMI from ignition systems, and temperature extremes under the dashboard. The 196 MBps throughput supports 800x480 WVGA and 1280x720 HD cluster displays at 60 Hz refresh. The AEC-Q100 qualification provides PPAP documentation and reliability data required by automotive Tier-1 suppliers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SN75LVDS84ADGG — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | SN75LVDS84ADGGR | SN75LVDS84ADGGG4 | SN65LVDS84AQDGG | SN75LVDS84DGGR | SN75LVDS83BDGGR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-pin TSSOP (DGG) | 48-pin TSSOP (DGG) - same | 48-pin TSSOP (DGG) - same | 48-pin TSSOP (DGG) - same | 48-pin TSSOP (DGG) - same | 48-pin TSSOP (DGG) - same |
| Function | 21:3 LVDS Serializer (Transmitter) | 21:3 LVDS Serializer (identical die) | 21:3 LVDS Serializer (identical die) | 21:3 LVDS Serializer (identical die) | 21:3 LVDS Serializer (original non-A rev) | 28:4 LVDS Serializer (different channel count) |
| Data Throughput | 196 MBps | 196 MBps | 196 MBps | 196 MBps | Up to 140 MBps (non-A rev) | Up to 175 MBps (28-bit version) |
| Max Parallel Clock | 65 MHz | 65 MHz | 65 MHz | 65 MHz | 40 MHz (non-A) | 65 MHz (28-bit) |
| Operating Temperature | 0°C to +70°C | 0°C to +70°C | 0°C to +70°C | -40°C to +85°C (AEC-Q100) | 0°C to +70°C | 0°C to +70°C |
| AEC-Q100 Qualified | No | No | No | Yes | No | No |
| Packaging Format | Tube | Tape & Reel | Tube (green/RoHS) | Tube | Tape & Reel | Tape & Reel |
Bảo phân biệt quan trọng
- A-revision with 65 MHz max parallel clock vs 40 MHz on original SN75LVDS84 (vsSN75LVDS84DGGR)
- Automotive-grade variant available in same TSSOP-48 footprint (vsSN65LVDS84AQDGG)
- Single-chip 21:3 compression vs discrete shift register + driver solutions (vsDiscrete FPGA-based serializer + LVDS driver approach)
Ghi chú thiết kế
The four LVDS differential pairs (Y0M/Y0P, Y1M/Y1P, Y2M/Y2P, CLKM/CLKP) must be routed as 100 Ω-impedance matched pairs on the PCB, with intra-pair length matching within 5 mils and inter-pair matching within 50 mils. Use a continuous ground reference plane beneath the LVDS traces, and avoid routing across plane splits. Place 100 Ω termination resistors (1% tolerance) across each LVDS pair at the receiver end of the link, as close to the receiver pins as possible, to minimize stub reflections and maximize signal integrity.
The 21 LVTTL parallel data inputs (D0-D20) plus CLKIN must be length-matched to within ±1 inch to avoid setup/hold violations at the rising-edge sample point of the on-chip PLL. Route the parallel LVTTL bus on an inner PCB layer adjacent to a ground plane to minimize crosstalk from the high-speed LVDS outputs. Estimated: at 65 MHz parallel clock, each bit has approximately 15.4 ns of period; mismatches greater than ±1 inch (~140 ps/in × 1 in × propagation delay factor) can cause data corruption. Add series termination (22-33 Ω) at the LVTTL drivers if reflections are observed on the bus.
Decouple each VCC pin (pins 25, 34, 47) with a 0.1 µF ceramic capacitor placed within 50 mils of the pin, plus a 10 µF bulk capacitor on the 3.3 V rail near the device. The SN75LVDS84ADGG draws approximately 100 mW typical from the 3.3 V supply, so total supply current is roughly 30 mA - well within the capability of standard LDO regulators. Keep the analog VCC and digital VCC planes separate if the design mixes sensitive analog circuitry on the same board, and join them at a single point near the SN75LVDS84ADGG's VCC pins to prevent ground loops.
Do NOT omit the 100 Ω LVDS termination resistors at the receiver end - the SN75LVDS84ADGG's LVDS drivers are current-mode and require the termination to develop the ~350 mV differential voltage. A common mistake is leaving LVDS pairs un-terminated, which results in roughly 700 mV swing that can damage receiver inputs and violates the LVDS standard. Additionally, ensure the SN75LVDS84ADGG's VCC and the SN75LVDS82/86A receiver's VCC are sequenced to come up together or with the transmitter first - reverse sequencing can latch up the LVDS drivers during power-up.
Thông tin tuân thủ
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose SN65LVDS84AQ variant for automotive. Halogen-free mold compound per TI material declaration.
